One of the Knicks’ key pieces is going to miss more time.

OG Anunoby underwent surgery in his right elbow to remove a bone fragment and is now expected to miss at least three weeks, ESPN’s Adrian Wojnarowski reported.

The ESPN insider said the small forward attempted to alleviate things by resting, but surgery ended up becoming the better option to get him ready for the end of the regular season and playoffs.

Anunoby, acquired from the Raptors in a blockbuster December trade, has not played since a Jan. 27 win over the Heat, missing five straight games with the elbow problem.

This is a developing story, check back for updates.