DALLAS (AP/105.3 The Fan) – Texas Rangers reliever Jake Diekman will take another step in his quest to return to a major league mound when he goes on a rehab outing with the Frisco RoughRiders.

The club announced that Diekman is expected to throw 15 pitches in Frisco’s game on Thursday night.

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Diekman has missed the entire season up to this point to treat colitis, a digestive condition he’s dealt with for most of his life.

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The left-hander underwent three surgeries to fix the condition. The third and final one occurred on June 9.

The 29-year-old Diekman was 4-2 with a 3.40 ERA and four saves last season for the AL West champions. He came to Texas along with ace Cole Hamels in a deal with Philadelphia at the trading deadline in 2015.

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(© Copyright 2017 CBS Broadcasting Inc. All Rights Reserved. The Associated Press contributed to this report.)