Derek Fisher is working out in hopes of a potential NBA comeback as a player. Fisher is also open to playing in China.

Sources say Fisher has indeed been "exploring options and expressing interest in playing again."

Fisher posted a workout video on Tuesday.

Fisher signed a multiyear contract in 2014 to coach the Knicks but was fired in February by team president Phil Jackson. 

Fisher will turn 42 this summer and would be the oldest player in the NBA.