"We know who Jeff is," Weiss said. "It's just a matter of going out there pain-free and healthy, and if that's the case, just go out there and do his thing."
Francis is also recovering from a left groin injury, which on Thursday he said felt noticeably better but had not completely healed. Through eight starts this season -- the most recent a six-inning, one-run outing against the Cubs on May 14 -- Francis is 2-3 with a 6.00 ERA.
Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. Ian McCue