Allen (hamstring) will begin a rehab assignment at Single-A Bradenton this weekend, Jason Mackey of the Pittsburgh Post-Gazette reports.
The Pirates said last week that Allen is unlikely to be ready for major-league game action until after the All-Star break, but he'll be able to join the Single-A club. The 29-year-old will require multiple rehab games before he's cleared to rejoin the Pirates, but he's on the right track in his recovery.