This week's blockbuster trade between the Cleveland Cavaliers and Boston Celtics involving Kyrie Irving for Isaiah Thomas, Jae Crowder, Ante Zizic, and the Brooklyn Nets' 2018 first round pick has moved into an uncertain situation following the physical of Thomas.

Thomas was examined in Cleveland on Friday as he rehabs his season-ending hip injury. Thomas has yet to begin running this offseason.

"It's a very sensitive situation," said one source.

Danny Ainge admitted that Thomas' injury played "some" part in the Celtics making the trade.

Irving is scheduled to take his physical with the Celtics on Saturday.

As of Saturday morning, the Cavaliers have yet to re-engage the Celtics on an amended trade.