Top NBA Draft prospect Michael Porter Jr. cancelled a pro day scheduled for Friday due to a strained hip, according to ESPN. Teams expecting to attend the workout were informed Wednesday that it would not be going through as planned. The Ringer first reported the event was axed.

Porter is one of the draft’s most divisive prospects given his uncertain health status after missing most of his lone season at Missouri. The forward had been considered a potential No. 1 overall pick coming out of high school but underwent microdiscectomy surgery on his back last year that caused him to sit out for months.

The Bulls’ medical staff recently performed a full examination on Porter that his camp planned to distribute to other teams. They released a statement Thursday afternoon.

ESPN says Porter’s camp “appears comfortable with his stock,” and that several teams in the top five are considering picking him. The Kings are foremost among those teams as the holders of the No. 2 overall pick, and there may be some steam there.

NBC Sports Bay Area also projects Porter as the No. 2 overall pick in its latest mock draft.

However, there’s still a lot of uncertainty around Porter, who has been considered a prime target for the Bulls. He could go as high as second or end up falling near the bottom of the top 10.