Oklahoma City Thunder forward Patrick Patterson has undergone an arthroscopic surgery in his left knee and will be re-evaluated in four-to-six weeks, according to ESPN's Royce Young. The stretch big man is expected to be ready for training camp on Sept. 26.

The Thunder stated there is no structural damage to Patterson's knee. His procedure was done Thursday in by Dr. Neal ElAttrache of the Kerlan-Jobe Orthopaedic Clinic in Los Angeles, according to Erik Horne of The Oklahoman.

The big man experienced discomfort in that same knee last season with his former team, the Toronto Raptors and had his training monitored by the Thunder during the summer. Rather than wait until the season started, Patterson chose to have surgery before the start of the regular season, which will now be in the middle of October.

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After signing a three-year, $16.4 million contract with the team on July 11, the 6-foot-9, 230-pound Patterson is projected to start at power forward after the Thunder shipped Domantas Sabonis and Victor Oladipo to Indiana in return for Paul George, leaving the four-spot wide open for him to slide into.

Patterson should flourish under OKC's drive-and-kick game and put his versatility to full bloom as a stretch-four with intangibles, providing yet another tool for Russell Westbrook on the perimeter.