A loose stitch from his previous operation will force Oklahoma City Thunder point guard Russell Westbrook to miss four to six weeks of the 2013-2014 NBA regular season.

Westbrook underwent an arthroscopic surgery on his right knee Tuesday when the OKC’s medical team identified in a previous procedure that there was “swelling due to a loose stitch.”

This looks like a minor setback for the Thunder, which was excited to see Westbrook in team practices already.

“Russell has been incredible in his work and rehabilitation. He has been pain-free and has performed at a high level during practice, but has experienced recent swelling that had not subsided,” said Sam Presti, Oklahoma City’s general manager in a report from realgm.com. “After careful consideration and recommendations from the medical team, we elected to do the procedure today based on our consulting physician’s belief that the swelling would be alleviated, and in turn give Russell the best chance for sustained performance throughout the season and beyond.

During the procedure it was determined that the source of swelling was due to a loose stitch, and fortunately we were also able to confirm that the meniscus has healed properly.”

Westbrook was initially injured in April of 2012 in a game vs. the Houston Rockets and missed the rest of the 2013 NBA postseason. The 5-year pro tore the meniscus in his right knee in that play and went under the knife after.

Westbrook even guaranteed in a previous International Business Times article, that he’ll come back a better player for the Thunder.

Westbrook, who has averages of 19.9 points and 6.9 assists in five years with the Thunder, will have to wait a little while longer to prove himself on that guarantee.