Stewart, who suffered the injury in a collision with left fielder Carlos Gonzalez while chasing a foul pop-up, has not appeared in a Cactus League game since. Rockies manager Jim Tracy said he will not rush Stewart.
"He's only played three innings and it's the 11th of March, so am I a little concerned?" Tracy said. "I'll tell you this: I do not want to feel compelled to think we have taken anybody and tried to rush him to the finish line to try to throw him out there. You're asking for trouble, and I had enough of that last year with 833 days worth [of combined disabled list days]."
Veteran Ty Wigginton could make the bulk of the starts at third in Stewart's absence. Utilityman Jonathan Herrera, who is strong defensively, also could play the position.