He is expected to be out until after the All-Star Break.
Westbrook underwent surgery after tearing the lateral meniscus in his right knee April 27 and then underwent another procedure on Oct. 1 to remove a loose stitch from the first procedure.
The team expected him to miss the first four to six weeks of the regular season, but Westbrook came back in early November.
“Russell has been playing pain free, but recently had experienced increased swelling. After consultation and consideration by his surgeon in Los Angeles, a plan was established to monitor the swelling that included a series of scheduled MRIs,” said Thunder general manager Sam Presti.