He will do so out of the bullpen as the Rangers' long reliever. Grimm is 7-7 with a 6.27 ERA in 17 starts, including 2-4 with a 9.91 ERA in his last eight starts, so the Rangers are moving him into the bullpen for now. Ross Wolf started against the Orioles on Saturday night and the Rangers have two more rotation moves coming. They are planning to activate Yu Darvish off the disabled list on Monday and Alexi Ogando on Tuesday.
Ogando threw a bullpen session without a problem on Saturday. The Rangers are waiting until they see how he recovers on Sunday before officially designating him as Tuesday's starter. Grimm would be an option if Ogando is not ready.
The Rangers also have two roster moves to make when Darvish and Ogando come off the disabled list. At that point, the Rangers could send Grimm back to Triple-A so he can get regular work as a starter.
T.R. Sullivan is a reporter for MLB.com. Read his blog, Postcards from Elysian Fields, and follow him on Twitter @Sullivan_Ranger. This story was not subject to the approval of Major League Baseball or its clubs.