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05/16/10 1:58 PM ET

Harrison throws pain-free bullpen session

TORONTO -- Rangers starting pitcher Matt Harrison, who has been sidelined on the 15-day disabled list with left biceps tendinitis, threw a bullpen prior to Sunday's game against the Blue Jays.

Harrison threw 25 pitches at roughly 80 percent with no pain.

The 24-year old left-hander had tried to pitch through pain in the past, but has decided to take a different approach this time around.

"It's May, I guess I don't want to rush it right now," Harrison said. "Take it slow and make sure it's healthy right now. If I try and push I'm going to have the soreness again, the same thing I had before."

In 2009 Harrison was limited to just 63 1/3 innings before undergoing season ending surgery to remove a rib in order to alleviate pain in his shoulder -- diagnosed as thoracic outlet syndrome.

Harrison -- 1-1 with a 5.29 ERA in 2010 -- will likely throw again in a couple days at closer to 100 percent velocity. He is eligible to come off the DL on May 22, when the Rangers take on the Cubs.

This story was not subject to the approval of Major League Baseball or its clubs.