Joseph is expected to be called up by the Phillies on Friday, ESPN's Jayson Stark reports.
The move has not been confirmed by the team, but it appears Jospeh is set to join the big club. Joseph hit .347 with six home runs and 17 RBI in 27 games with Triple-A Lehigh Valley this season and posted a 1.122 OPS against lefties, so he will likely replace Darin Ruf as the platoon partner for Ryan Howard at first base.