First wave of Dodgers call-ups arrive, sans Carlos Triunfel (designated for assignment).

Alex Guerrero

Alex Guerrero hit four home runs in his final 10 games with Triple-A Albuquerque. (Associated Press photo)

Of all the transactions the Dodgers made Monday, when rosters were allowed to expand past the previous 25-man limit, only one could be considered a surprise.

Infielder Carlos Triunfel, whom the Dodgers claimed off waivers from the Seattle Mariners in April, was designated for assignment.

By removing Triunfel from the 40-man roster, the Dodgers were able to add Joc Pederson to their 40-man roster. Pederson was joined by infielder Alex Guerrero, catcher Tim Federowicz and pitcher Yimi Garcia on the Albuquerque-to-Los Angeles express Monday. Infielders Miguel Rojas and Erisbel Arruebarrena and pitcher Carlos Frias are expected to arrive in the Dodgers’ clubhouse tomorrow.

Pederson and Garcia will be making their major-league debuts.

“Yimi gives us another arm out there, a guy who’s pitched late in games at the Triple-A level, also has been pitched in multiple-inning situations,” Dodgers manager Don Mattingly said. “At this point (Garcia offers) protection for us in different ways. Not necessarily are we going to throw him in the middle of an eighth-inning jam, but he’s here to protect other guys.”

Guerrero had a .286/.313/.500 slash line after rejoining the Isotopes in July. He hit four home runs in his final 10 games prior to the promotion.

On May 20, Guerrero was the victim of a well-documented attack by then-teammate Miguel Olivo during a brawl in the Isotopes’ clubhouse. The fight cost Guerrero the upper portion of his left ear, which was successfully re-attached. He didn’t play another game for 51 days after the attack.

Guerrero, who played second base, left field, shortstop and third base (in order of games played), took ground balls at second base and fly balls in the outfield Monday.

Federowicz batted .131 (8 for 61) with one home run in 18 games with the Dodgers and slashed .328/.383/.555 at Albuquerque. After his last minor-league demotion, Federowicz’s slash line ticked up to .335/.392/.587.

“This year’s been a back and forth year for him, but he went down and found his stroke again,” Mattingly said. “He gives us a third catcher.”

Triunfel appeared in 12 games with the Dodgers this season, mostly as a defensive replacement at shortstop. The 24-year-old batted .223/.256/.330 at Triple-A Albuquerque.

But he wasn’t needed, mainly, because the Dodgers already had plenty of reserve infielders to choose from in September: Justin Turner, Darwin Barney, Rojas, Arruebarrena and Guerrero. Scott Van Slyke and even Andre Ethier have made appearances at first base behind starter Adrian Gonzalez.

One more transaction Monday: Chris Perez, who had been on the disabled list since August 4 because of bone spurs in his right ankle, was activated from the 15-day disabled list.