The Athletic's Ken Rosenthal first reported the move.
Forsythe originally joined the Phillies on Feb. 7 with a deal that included an invitation to spring training.
Before spring training was canceled because of the coronavirus pandemic, Forsythe hit .348/.464/.826 with three home runs in 23 at-bats over 11 games.
Despite those robust hitting numbers, Forsythe was facing an uphill climb to make Philadelphia's 30-man roster.
Rhys Hoskins, Didi Gregorius, Jean Segura and Scott Kingery will make up the Phillies' starting infield. They included six other infielders in their initial player pool, including Forsythe, Alec Bohm, Josh Harrison, Ronald Torreyes, Neil Walker and Phil Gosselin.
Forsythe has played for five different teams over the past nine seasons. The 33-year-old owns a .246/.327/.370 career slash line in 958 games. He has experience playing all four infield positions and both corner outfield spots.