KISSIMMEE, Fla. -- The Astros are awaiting results of an MRI performed Monday on right-hander Asher Wojciechowski, who's been ailing with a lat strain since Feb. 1. The lat is a large muscle on the side of the back that helps support the shoulder.
Wojciechowski, one of the club's top young arms, tried to throw Thursday and said he felt like he aggravated the injury.
"Then I had some swelling, and I guess they wanted to check it out again," he said. "It feels like I re-aggravated it, and it's just frustrating. It's one of those muscle tissues that I'm going to have to rest and let it heal fully before I can do anything."
Wojciechowski strained his oblique in college and couldn't do anything except throw a baseball.
"I had to just give it time, but this is taking a lot longer than I thought it would," he said.
The Astros are in agreement about not rushing him back.
"He's going to need to rest for a few days, maybe a little longer," general manager Jeff Luhnow said. "We don't want to rush him. It's nothing too concerning, but we want to make sure we have all the information."
Brian McTaggart is a reporter for MLB.com and writes an MLBlog, Tag's Lines. Follow @brianmctaggart on Twitter. This story was not subject to the approval of Major League Baseball or its clubs.