Dodgers head athletic trainer Sue Falsone had a busy day Thursday -- a day off for the team, but hardly a day off for the trainer with a disabled list of eight players.

Justin Sellers became the latest addition as he took the place of Jerry Hairston Jr. on Friday. Hairston was in the starting lineup and Sellers was reduced to performing core exercises after an MRI Thursday revealed a slipped disc as well as a stress fracture in his lower back.

The injury is related to the head-over-heels catch Sellers made May 14 -- but not entirely.

"He had what's called a spondylolysis, or a stress fracture, back in high school," Falsone said. "A lot of younger athletes have it. A lot of older athletes have it. It's no big deal -- a little stress fracture in the back."

Falsone went on to explain that the stress fracture created an area of weakness that was exacerbated when Sellers tumbled into the stands. At first he reported back pain, then numbness down his right leg from the hip to the toe.

Both Sellers and Falsone were optimistic that he would only need the minimum 15 days on the disabled list, but "if it doesn't get better, we might have to remove part of the disc," Sellers said.

The infielder is hitting .205 with three doubles and a home run in a reserve role.

Clayton Kershaw doesn't have the longest consecutive scoreless innings streak by a Dodger pitcher this season. His National League Player of the Week award collected Monday is nothing new, either -- it's the third won by a Dodger in 2012 (Matt Kemp won it on back-to-back weeks to begin the season).

But things are going good right now for the Dodgers, and Kershaw joined the party last week. He went 2-0 with a 0.00 ERA in 16 innings (the most thrown by any NL pitcher), with 10 strikeouts, three walks and 10 hits allowed.

Seven days ago, Kershaw tossed seven shutout innings, striking out six and allowing just four hits in the Dodgers' 3-1 win over the visiting Arizona Diamondbacks.

On Saturday night, Kershaw outdueled St. Louis Cardinals starter Jake Westbrook in a 6-0 shutout at Dodger Stadium. He also doubled and scored a run in the Dodgers' four-run seventh inning, which broke a 0-0 tie.

The left-hander currently ranks second in the National League with 61.2 innings pitched, and is third among qualifying pitchers with a 1.90 ERA and 0.88 WHIP. This is his second career weekly award, the other coming June 27, 2011.

Kershaw's streak of 22 scoreless innings dates back to May 8 against the Giants and is 2.2 innings shorter than the season-high set by Chris Capuano.

In recognition of his award, Kershaw will be awarded a watch courtesy of Game Time.

The Dodgers visit the Diamondbacks tonight (6:40 p.m., Prime Ticket).

An MRI on Matt Kemp's left hamstring revealed a strain, and the Dodgers center fielder is day-to-day. Tony Gwynn Jr. is starting in center field and Kemp was listed as available if the Dodgers need him to pinch hit. Kemp has played 399 consecutive games, the longest streak in the major leagues.

Kemp did not take part in pregame activities Monday -- the team stretched and took batting practice without him -- which only reduces the likelihood of his appearing in tonight's game.

However, the Dodgers might need him.

The Dodgers signed free-agent infielder Aaron Miles to a minor-league contract. A team spokesperson said the 35-year-old infielder is currently in Arizona awaiting his assignment.

Miles played 136 games for the Dodgers last season, mostly at second and third base, batting .275 with three home runs and 45 RBIs. He has hit .281 over a nine-year career with five different teams.

The Dodgers signed Adam Kennedy and Jerry Hairston Jr. to fill their backup infield spots rather than re-sign Miles, who hasn't had a contract since last season.

Also Friday, the Dodgers requested release waivers on right-handed reliever Mike MacDougal, who was designated for assignment May 3. MacDougal can become a free agent Sunday.

A pair of injury updates that won't make tomorrow's editions:

1. An MRI on Jerry Hairston Jr.'s left hamstring revealed a strain, manager Don Mattingly said, which was expected. The Dodgers don't play tomorrow, so no decision will be made as to whether or not Hairston will go on the disabled list. Hairston hasn't played since Sunday.

2. Outfield prospect Alfredo Silverio underwent UCL Reconstruction (Tommy John surgery) Wednesday morning, a team spokesperson said in an e-mail. Dr. Neal ElAttrache performed the surgery at Kerlan Jobe in Los Angeles. Silverio will return to the Dodgers' rehab facility at Camelback Ranch in Glendale, Ariz. and start his rehab tomorrow. According to the team spokesperson, Silverio isn't experiencing any symptoms from the concussion he suffered in a car accident in January.

The Dodgers designated Mike MacDougal for assignment Thursday and activated Ronald Belisario from the inactive list. Belisario had been serving a 25-game, league-mandated suspension for a positive drug test, and needed to be released, DFA'd or added to the major-league roster today.

Since that inevitability had been lingering since the season began, MacDougal had to be feeling the heat after he allowed five runs (all earned) in 5.2 innings for a 7.94 ERA. The 35-year-old right-hander also walked six and struck out four.

The Dodgers have 10 days to either add MacDougal to the 40-man roster, trade him, release him or place him on waivers (within seven days).

Bobby Abreu is a Dodger.

Less than a week after he was released by the Angels, the 38-year-old outfielder signed a one-year contract with the Dodgers in advance of today's game against the Chicago Cubs. Abreu was not listed in the starting lineup.

The 17-year veteran was hitting .208 at the time of his release. Last season, Abreu batted .253 with eight home runs and 60 RBIs. Abreu is a lifetime .293/.397/.877 (BA/OBP/OPS) hitter and counted Don Mattingly as his hitting coach with the New York Yankees from 2003-06.

To make room for Abreu on the active roster, infielder Justin Sellers was optioned to Triple-A Albuquerque. Sellers batted .150 (3-for-20) with two doubles in 10 games (7 starts).

The Dodgers now have 40 players on their 40-man roster.

On a day when the visiting team at Dodger Stadium had the biggest minor-league call-up of the day -- if not the year, given the hype surrounding the 2010 No. 1 draft pick Bryce Harper -- Nate Eovaldi's recall made but a small ripple, if one at all.

Eovaldi found out Thursday morning that he was headed to Los Angeles for the first time this season and on Friday the Dodgers officially announced his recall from Double-A Chattanooga. Left-hander Michael Antonini, recalled Tuesday from Triple-A Albuquerque, was optioned back to the Isotopes.

"It was planned from the beginning," manager Don Mattingly said. "With Atlanta lefty-heavy, we wanted an extra lefty."

Both he and Eovaldi said the plan hasn't changed for a pitcher who was tabbed the team's "sixth starter" coming out of spring training. The 22-year-old had been used primarily as a starter the last two seasons in the minors, and started in six of his 10 appearances last season during an August/September call-up with the Dodgers.

But Eovaldi's last two starts for the Lookouts lasted only one inning. After the first, he was pulled unexpectedly because of a potentially inhibiting groin injury to Dodgers starter Chad Billingsley. In the second (on Wednesday) he was told before the game that he would only be needed for an inning.

This time around, he's being slotted as an extra arm out the bullpen, which shouldn't pose a problem.

"My arm's always been able to get warmed up easily," Eovaldi said.

Following up on yesterday's item about Juan Rivera: The veteran said Wednesday that he does not expect to go on the disabled list as a result of the left hamstring soreness that forced him to leave Tuesday night's game.

"Give me a couple days," said Rivera, always a man of few words. "Two days."

Rivera will not play against the Atlanta Braves tonight, but that was a previously planned day off, manager Don Mattingly said. The Dodgers are off Thursday.

Rivera stretched Wednesday with head trainer Sue Falsone and "he did more than she thought he would be able to," Mattingly said.

One other injury update: Aaron Harang had a large bruise on his left foot after hitting a ball off the foot Tuesday. He isn't expected to miss his next start.

A couple notes and quotes that won't make it to print in their entirety ...

Matt Guerrier was in the Dodger clubhouse but out of uniform Tuesday night after an MRI earlier in the day revealed no ligament damage in his right elbow. He was diagnosed with tendinitis and placed on the 15-day disabled list retroactive to April 19.

"For a little bit I thought I was getting back into it, so I pitched through it hoping it would get better," he said.

By the end of spring training, he added, the injury "was really minor at that point. I was hoping it would work its way out. It didn't."

Guerrier confirmed that he would have been available to pitch in an emergency situation Monday night against the Atlanta Braves. But with his recovery period from each outing taking longer than expected, Guerrier agreed it was best to rest.

"You start to put other guys in tough positions in the 'pen when every day after I pitch I need a day off," he said.