Toronto Raptors forward Amir Johnson has undergone surgery to repair instability in his left ankle, the team announced Friday.

The procedure was performed by Dr. Robert Anderson, a foot and ankle specialist, in Charlotte, N.C.

Johnson missed nine games in 2010-11, including the final five contests of the season, with a sore left ankle.

Johnson, who signed a five-year deal worth US$34 million last summer, will conduct his rehabilitation in Los Angeles and is expected to be ready for training camp.

He averaged career highs in points (9.6), rebounds (6.4), minutes (25.7) and starts (54) in 2010-11.