New York Knicks forward OG Anunoby has had a post-surgical flare-up in his right elbow and is expected to miss more than just Monday night's game against the Golden State Warriors, sources told ESPN.

Anunoby -- who returned for three games following a Feb. 8 procedure to remove a loose particle from his shooting elbow -- will need for the elbow to calm down before he can return to the lineup, sources said.

That timeline is currently unclear.

The Knicks are 15-2 with him in the lineup since Jan. 1 and 8-10 with him sidelined. Anunoby's plus-297 plus-minus since joining the Knicks is third best in the NBA in that span, according to ESPN Stats & Information research.

Anunoby -- who arrived in a December trade from the Toronto Raptors -- is holding opponents to 35% shooting as the closest defender since Jan. 1, best in the NBA among players to defend 150 or more shots, per Second Spectrum Tracking.