Former Red Raider Football player and San Fransisco 49ers star Michael Crabtree tore his Achilles heel during offseason workouts on Tuesday.

The injury occurred during 7 on 7 drills while Crabtree was running a route and brought down the five-year NFL veteran during the workout.

Crabtree underwent surgery to repair the Achilles tendon on Wednesday morning at Stanford hospital.

49ers Head Coach Jim Harbaugh visited the receiver after surgery on Wednesday and said the surgery was successful on Crabtree.

Surgery was successful and we do not anticipate it will be season-ending for Michael. It was completely torn and it was completely repaired,” according to Harbaugh.

"The good news is he woke up from the surgery and the first thing he asked the Doc was how it went."

The injury is expected sideline Crabtree for the first part of the 2013 season. Crabtree had over 1,000 yards receiving last season including 5 catches for 109 yards and Touchdown in the Super Bowl loss to the Baltimore Ravens.