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05/21/09 11:57 AM ET

Tigers activate Robertson from DL

Left-hander returns to bullpen in time for Thursday's finale

DETROIT -- The Tigers activated Nate Robertson from the 15-day disabled list Thursday morning, bringing back the veteran left-hander to their bullpen in time for the series finale on Thursday afternoon against the Rangers.

Robertson went on the DL last week with a lower back strain after he injured himself working out in Cleveland. His back locked up on him during an off-day in Minnesota, leaving him unavailable for the series against the Twins, but a combination of anti-inflammatories and therapy loosened up his back a few days ago. He was able to complete a throwing session and was cleared for action.

Robertson has allowed seven runs on 10 hits in 10 innings this season, walking six and striking out seven. He serves as both a second lefty reliever behind setup man Bobby Seay and a long relief option alongside Zach Miner.

Detroit made room for Robertson's return after Wednesday's game by optioning left-hander Luke French to Triple-A Toledo.

The Tigers could make another move after Thursday's game to bring back Magglio Ordonez from the family medical emergency list.

Jason Beck is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.