Las Vegas Raiders quarterback Derek Carr practiced for the second straight day on Thursday, a good indication that he will play on Saturday against the Miami Dolphins, coach Jon Gruden said.

Carr injured his groin will he was running around right end in the first quarter against the Los Angeles Chargers on Dec. 17. He was replaced by Marcus Mariota.

Carr was limited in practice on Tuesday but was a full participant on Wednesday and Thursday.

“I’m not going to say anything other than I’m optimistic, but I’m not a mind reader,” Gruden said Thursday. “I just know that he had an injury that caused him to miss the game last week and I respect that. He’s a tough guy, man. I’m optimistic he’ll be ready to go, yes.”

Carr has a career-best 102 passer rating this season, throwing for 3,396 yards and 24 touchdowns.

Mariota, a former No. 2 overall draft pick by the Tennessee Titans in 2015, made his debut for the Raiders against the Chargers by throwing for 226 yards and a touchdown, in addition to rushing for 88 yards and another score, in a 30-27 overtime loss.