(CBS) The Cubs have activated right-handed reliever Justin Grimm from the disabled list and called up outfielder Matt Szczur from Triple-A Iowa, they announced Wednesday afternoon. Both will be available for the evening game at St. Louis.

In corresponding moves, Chicago optioned outfielder Junior Lake to Triple-A and designated right-handed reliever Anthony Varvaro for assignment.

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Grimm had been on the 15-day DL with right forearm inflammation. He hasn’t yet pitched in 2015 in the big leagues. He had a 3.78 ERA in 73 appearances for the Cubs in 2014.

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Szczur made the Opening Day roster and was 2-of-10 (.200) in eight games before being sent down to Triple-A.

Lake was 4-of-14 (.286) with one RBI in four games for the Cubs this season.

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Varvaro was claimed off waivers from the Red Sox on Sunday but didn’t appear in a game for the Cubs yet. He had a 4.09 ERA in nine appearances for Boston this season.