Getty Images

Just hours after news broke that 49ers receiver Michael Crabtree tore his Achilles tendon on Tuesday, Crabtree has already had surgery.

Crabtree had his surgery today, Chris Mortensen of ESPN reports.

According to multiple reports, doctors believe Crabtree will be out about six months. That would put his return in late November, around Week 12 of the regular season.

For the 49ers, losing Crabtree for that long is a major blow to the offense. Last season Crabtree was by far the 49ers’ top weapon in the passing game, with 85 catches for 1,105 yards. No one else on the 49ers had even half that many catches or receiving yards.

With Crabtree out for most of the season, the 49ers will need the newly acquired Anquan Boldin and last year’s No. 2 receiver, Mario Manningham, to step up. They’ll also need some production out of last year’s first-round draft pick, A.J. Jenkins, who did nothing as a rookie, and from this year’s fourth-round draft pick, Quinton Patton.