Dodgers notes: Carlos Frias, Chris Hatcher, Paco Rodriguez

LOS ANGELES -- A trio of sidelined pitches have made progress this week in their return to the Dodgers, with Carlos Frias, Chris Hatcher and Paco Rodriguez at various stages in their hopeful return to the Dodgers.

Carlos Frias will pitch again Friday for Class-A Rancho Cucamonga, continuing to rehab from lower back tightness. Frias started for the Quakes on Sunday, but was pulled with two outs in the first inning after allowing two runs on three hits.

"He came out in the first inning because he got to 24. He went down to the bullpen and finished his throwing. Any time you're on a rehab they're not going to let him throw 30 in an inning."

Frias was scheduled to throw 50 pitches on Sunday, which he did after two simulated innings in the bullpen after he was removed from the game.

Having Frias unavailable to return to the Dodgers this weekend explains in part why Zach Lee is still on the active roster. The Dodgers rotation is very much in flux at the moment, with Friday's non-waiver trade deadline looming.

Zack Greinke will start Friday or Saturday, depending on whether the Dodgers want to give him an extra day of rest after his Sunday start. Mike Bolsinger will factor in there somewhere, likely Friday or Saturday, but that could change depending on when the Dodgers' new expected acquisition is ready to pitch.

David Price and Mike Leake pitched on Tuesday for the Tigers and Reds, respectively, so neither would be available until Sunday, while Cole Hamels was scratched from his scheduled Thursday start for the Phillies as the deadline nears.

Brett Anderson started Tuesday night for the Dodgers and might be in line for a Sunday start as well, though the team might want to use the off day(s) to give him extra rest as well.

Chris Hatcher will pitch another inning for Rancho Cucamonga on Wednesday. The right-hander has struck out four with no walks in two innings for the Quakes so far in his rehab assignment, allowing two runs on four hits. Hatcher last pitched for the Dodgers on June 14, sidelined with left mid-back inflammation.

Paco Rodriguez, who had arthroscopic surgery on his left elbow on July 2, has started a light throwing program. Don Mattingly said there isn't yet a timetable for Rodriguez's return, though initial reports had Rodriguez possibly back in early September.

"Paco is doing really well," Mattingly said. "He's feeling great."