Former Boston Celtic/Minnesota Timberwolves big man Al Jefferson is out indefinitely after tearing his ACL during Sunday’s game against the New Orleans Hornets, according to multiple reports. An MRI revealed the extent of the injury on Monday. Jefferson, who received a standing ovation at the Garden earlier this month, was having a breakthrough season. He was averaging 23.1 points and 11.0 rebounds through 50 games. No date for surgery has been set. Jefferson was the centerpiece for the Kevin Garnett trade in 2007.

In a statement on Timberwolves.com, head coach Kevin McHale said, “This is an unfortunate situation for Al and we wish him a quick recovery. Al has been playing at an all-star level all season and has been our go-to-guy on the court. Knowing Al, he will work hard in his rehab efforts to get back on the court as soon as possible.”