6/30 21:57: Tom Krasovic of Fanhouse tweets, “Veteran scout: Mark Prior “just all right” in today’s throwing session.”

6/28 23:12: Tracy Ringolsby of FOXSports says right-handed pitcher Mark Prior is trying to make a comeback. The 29-year-old will work out for major league clubs at USC on Wednesday.

Ringolsby says most major league teams are expected to have a scout in attendance.

There were rumors in mid-May about Prior starting comback. At the time he took a line drive off of his pitching shoulder when throwing batting practice to a local team. He was shutdown for three weeks after the incident.

Prior last pitched for the Cubs in 2006 when he went 1-6 in nine games. He has a career 42-29 record with a 3.51 ERA.  He had a promising start, but his career was derailed with several injuries.