PHOENIX -- Zack Greinke threw a bullpen session Saturday afternoon and experienced no issues with his abdominal muscle.

“Zack’s bullpen went very good and he’s going to start for us on Tuesday,” D-backs manager Torey Lovullo said.

Greinke was forced to exit his start Wednesday with two outs in the eighth inning after he experienced tightness in his abdominal muscle.

An MRI taken of the area Friday came back “clean” according to the team, and Greinke played catch Friday. Saturday’s bullpen was the final hurdle he needed to get past for the team to decide to pencil him in for Tuesday’s start against the Padres in San Diego.

Peralta scratched with trap muscle injury

D-backs outfielder David Peralta was a late scratch from the lineup Saturday after experiencing some issues with his right trap muscle.

Peralta was removed from Wednesday’s game in the sixth inning with tightness in the trap, but following Thursday’s team off-day, he was back in the lineup and homered.

Apparently, though, he also aggravated the injury when he dove for a Buster Posey line drive in the first inning.

“He was trying to make a go of it today, but I just elected that it was best to get him off his feet and give him the day,” D-backs manager Torey Lovullo said. “We feel like he’ll be day to day and he’ll be available tomorrow. He’ll be hopefully available tonight if needed. I just made that decision based on the simple fact that I’m willing to sacrifice today rather than seven possible days -- if something were wrong and he were to do more damage in there. It was a no-brainer for me to get him off of his feet.”

Peralta has been one of the D-backs' top hitters this year with a slash line of .319/.362/.544.

Walker in relief?

Right-hander Taijuan Walker, who was about a month away from returning from Tommy John surgery, was diagnosed this past week with a shoulder capsule sprain and he received a platelet-rich plasma injection.

With the injury, Walker will not be allowed to throw for six weeks, meaning he will essentially have to start his throwing program all over again.

“It just happened out of nowhere,” Walker said of the shoulder sprain. “It definitely sucks. I feel like I’ve done everything right, been working hard and doing everything I need to do. Just more time to heal my elbow and get stronger.”

Because he’ll have to begin building up his pitch count all over again in six weeks, there might not be enough time for Walker to be able to return this year as a starter. It’s possible the team could look to have him as a reliever at the end of the season.

“I don’t think it would make sense for me to come back and try to ramp up to start,” Walker said. “I think getting out of the season, making sure I feel really good and strong, if I get five innings -- if I get two innings -- just to get out there and know I feel good and confident throwing the ball and everything and my stuff feels good, that would give me a lot of peace of mind going into next year.”