Dodgers’ Wednesday starter remains to be determined.

Carlos Frias

Carlos Frias is scheduled to start Monday for Triple-A Oklahoma City, but could make a spot start for the Dodgers on Wednesday instead. (Associated Press photo)

PITTSBURGH — The Dodgers still haven’t identified which pitcher will start Wednesday in Milwaukee.

The front-runner would be right-hander Carlos Frias, who is still listed as the starting pitcher for Triple-A Oklahoma City on Monday, but for a minor procedural problem. He was optioned to Triple-A June 21 and therefore isn’t eligible to be recalled until July 1 per MLB rules. An exception can be made when another player is injured, so any lingering hangnails between now and Wednesday could vault Frias into the Dodgers’ rotation.

Frias has thrown 36 ⅔ innings at Double-A and Triple-A this season since returning from an oblique injury at the start of the season. He has a combined 3.93 ERA across a mix of good and bad outings. The last one was good: 5 ⅓ innings of shutout ball Wednesday in Oklahoma City against Round Rock.

Frias would be pitching with an extra two days’ rest, however. Brock Stewart, who started only the third Triple-A game of his career Friday, is already lined up to start Wednesday on regular rest. The 24-year-old right-hander has performed well at Oklahoma City (six earned runs, 27 strikeouts in 18 ⅔ innings) in a small sample size. Stewart, the Dodgers’ sixth-round pick in 2014 out of Illinois State, began the year at Single-A Rancho Cucamonga.

Dave Roberts didn’t rule out Stewart in his pregame scrum Sunday. He did rule out right-hander Mike Bolsinger, and previously ruled out Hyun-jin Ryu and Brandon McCarthy. Ross Stripling is out; he’ll piggyback off Ryu’s next rehab start for Oklahoma City on Tuesday. So is prospect Jose De Leon, who threw 77 pitches in 3 ⅓ innings Saturday, and Nick Tepesch, who was designated for assignment after his spot start Friday.

Roberts did say the team is looking internally and that a bullpen game is unlikely: