Philadelphia completed the signing on Thursday. Robertson's pact includes a third-year club option for the 2021 season. Sources told MLB.com that the deal is for $23 million, with the option coming in at $12 million. Robertson's pact includes a $2 million buyout.
The 2011 All-Star and 2009 World Series champion posted an 8-3 record with a 3.23 ERA and five saves in 69 games last season for the New York Yankees. Robertson owns a career 2.88 ERA and a 53-32 mark with 137 saves in 11 seasons.
Robertson played the first seven seasons of his career for the Yankees before signing with the Chicago White Sox as a free agent during the 2014 offseason. He later rejoined the Yankees as part of the Todd Frazier trade in 2017.
"It was a productive day, and I expect the dialogue to continue," Phillies general manager Matt Klentak said in a conference call, according to MLB.com.