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3/23/2013 8:24 P.M. ET

De La Rosa misses start with left forearm tightness

Rockies lefty set to toss two innings in Minor League game Sunday

SCOTTSDALE, Ariz. -- Rockies pitcher Jorge De La Rosa's scheduled start on Saturday night against the Padres was pushed back because of left forearm tightness that caused him to skip a bullpen session this week. The lefty is now scheduled to throw two innings in a Minor League game Sunday.

Right-hander Jeff Manship, who pitched for the Twins from 2009-12 (3-2, 6.20 ERA in 31 games, including six starts), was tabbed as Saturday night's starter.

Last season, periodic forearm tightness was one of the reasons De La Rosa's comeback from Tommy John elbow surgery in 2011 was delayed on several occasions, and he made just three starts in the Majors (0-2, 9.82 ERA). De La Rosa is 39-26 with a 4.48 ERA for the Rockies (2008-12), and is the team's highest-paid player for the '13 season at $11 million.

De La Rosa has been healthy this spring. In four games, including three starts, he has a 2.84 ERA with 13 strikeouts and eight walks in 12 2/3 innings. In his last two starts, De La Rosa has given up one run and six hits in nine innings, with 10 strikeouts and four walks.

Saturday marked the second time in as many days that the Rockies have scratched a key starter.

On Friday, right-hander Jhoulys Chacin -- who has been announced as the starter on Opening Day, at Milwaukee on May 1 -- was scratched because of back spasms that he sustained on Thursday. Chacin said on Saturday that the problem is no big deal, and he was told he would pitch two innings on Saturday night.

Thomas Harding is a reporter for MLB.com. Read his blog, Hardball in the Rockies, and follow him on Twitter @harding_at_mlb. This story was not subject to the approval of Major League Baseball or its clubs.