He's got good stuff. He's interesting, Red Sox manager Alex Cora said.
Keller was 38-53 with a 4.27 ERA for Kansas City in 114 starts and 36 relief appearances from 2018-23.
Right-hander Zack Kelly was optioned to Triple-A Worcester. Kelly gave up one run and two hits over three innings in Saturday's 6-3 loss to Milwaukee.
On Saturday, right-hander Garrett Whitlock said his season is over and he expects to have his right ulnar collateral ligament repaired with an internal brace.
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