Anderson (knee) is scheduled to throw a side session next week, the Associated Press reports.
Anderson was placed on the disabled list Sunday with left knee inflammation and would have been eligible to return by the end of the weekend, but it appears that he's not progressing as quickly as the Rockies may have hoped. Manager Bud Black hinted that after Anderson completes the side session, the left-hander could head out on a rehab assignment, so he may be trending toward a late-June return at this point. Jeff Hoffman was called up from Triple-A Albuquerque to fill the vacancy in the rotation, and could stick in a starting role once Anderson returns if he continues to perform well in his stead. Anderson has struck out nearly a batter per inning this season, but carries an ugly 5.85 ERA and 1.48 WHIP.