LOS ANGELES -- The D-backs placed right-hander Taijuan Walker on the 10-day disabled list Sunday morning, one day after he left his start against the Dodgers in the second inning with right forearm tightness.
Reliever Silvino Bracho was recalled from Triple-A Reno to take Walker's spot on the 25-man roster.
"I woke up it felt good, same as yesterday, didn't get any worse," Walker said. "I feel really good about it. Everything feels strong in there, just going to go on the DL just to be cautious."
The team has scheduled an MRI for Walker on Monday, but the strength tests that he underwent Saturday night have him and the organization feeling optimistic that it will not be that serious.
"I think we'll find out more with the MRI, I believe, on Monday," D-backs assistant general manager Jared Porter said. "But from what I understand, he feels nothing has changed since last night. He feels fine, but just more of a 'Hey, he felt something during the game and we want to be very careful at this point in the season.' That's the hope."
"I think everyone that's felt tightness in the forearm, the first thing everyone thinks is, 'Oh, it's Tommy John,'" Walker said. "But I feel like you'd kind of know if it was real serious."
The D-backs will need a starter to fill Walker's spot next Friday against the Padres, but for now, they will use Bracho as an extra reliever in the bullpen.
Triple-A Reno starters Braden Shipley and Matt Koch are the likely candidates to get a start for the D-backs in Walker's place. Albert Suarez and Kris Medlen are also starters for Reno, but neither is on the 40-man roster.
The D-backs could also call up a starter for Friday, option him back down after the game and call up a reliever until that spot in the rotation comes up again. That's what they did last year when Shelby Miller went down as they alternated starts between Zack Godley and Shipley before settling on Godley.
"I think we feel really good about our depth right now," Porter said. "We haven't really sat down and talked through it yet, but there's a lot of options. Whether it's one guy the whole time, whether it's kind of guys in and out, we'll see."