The Phillies designated Keller for assignment Wednesday, Robert Murray of FanSided.com reports.
Keller gave up one run in three innings during his MLB debut July 25 but has coughed up 12 runs in just 9.2 frames since returning to Triple-A Lehigh Valley. The 32-year-old righty will now lose his place on the 40-man roster to make room for Nestor Cortes, who signed a major-league deal with the Phillies on Wednesday.
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Phillies' Brian Keller: Sent to Lehigh Valley
Rotowire
The Phillies optioned Keller to Triple-A Lehigh Valley on Friday.
After making just one appearance with the Phillies on June 25, Keller will re-join the Triple-A club. The 32-year-old allowed just one run on two hits while striking out three in three innings during his lone appearance. Philadelphia elevated Andrew Painter from Lehigh Valley to replace Keller on the 26-man roster.
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Phillies' Brian Keller: Fares well in big-league debut
Rotowire
Keller took a no-decision Saturday against the Yankees, allowing one run on two hits and no walks in three innings. He struck out three.
Making his major-league debut, Keller fared well on the bump while acting as a long reliever Saturday. Austin Wells tagged the 32-year-old right-hander for a solo home run in the third inning, but Keller was impressive otherwise against a formidable Yankees lineup. Philadelphia has had a hard time finding stability out of their fifth rotation spot since sending Andrew Painter down to the minors for seasoning, but Keller is tentatively lined up to take the ball next in Baltimore for now.