Grudzielanek has been out since Aug. 1 when he collided with first baseman Ross Gload while catching a popup in right field. Grudzielanek suffered a sprained right ankle and a torn deltoid ligament.
It's possible that Grudzielanek is out for the season.
"It's a situation where what am I going to benefit by going out there the week or 10 days? It's just something that I'll look at Thursday after this MRI and see how much is actually healed," he said. "I mean I'm not going to go back out there when there's still a chance to tear it and have surgery."
Grudzielanek has played through injuries and last year pushed himself for quick returns after two knee surgeries. This time he's being cautious.
"I'm not really going to push the envelope. If it was an injury where I couldn't hurt anymore or something like that, I played through a lot of things and that'd be different," he said. "This is something where it's a tear and if I do something funky with a slide or hit the bag wrong, then I could be in trouble and I want to avoid that at all costs."
Rookie pitcher Luke Hochevar already has been declared out for the season with a contusion of the right rib cage. He had 22 starts and finished 6-12 with a 5.51 ERA.
"I made some good strides, got a lot better, learned some of the hitters, learned the league, learned what it takes to be successful. That's what's important to me," Hochevar said. "Obviously winning games is important. It is the most important. From my first year, I would say that I was pleased with the way I went out every time and got better, made adjustments and continued to gain my confidence up here."
Dick Kaegel is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.