Diekman received a one-year contract with a mutual option for the 2020 season. Sources told MLB.com that Diekman will have a base salary of $2.25 million, with a $500,000 buyout if the option isn't exercised.
Diekman has a 3.75 ERA and a 28 percent strikeout rate in 312 innings pitched over his seven-year MLB career.
The Philadelphia Phillies selected Diekman in the 30th round of the 2012 MLB Draft. He has a 14-15 record in the majors and 383 career strikeouts.