Brett Brown is lacking "internal momentum" to return as the Philadelphia 76ers coach next season, sources told Adrian Wojnarowski of ESPN.

Brown has been the head coach of the Sixers since 2013, and has a regular season record of 178-314. 

Wojnarowski adds that a decision on Brown's future could come soon.

League sources told Chris Haynes of Yahoo! Sports that the Sixers are expected to part ways with Brown in the coming days.

Haynes adds that there was a lack of trust between Brown and his players, and that was never able to fully hold the locker room accountable.  

The Sixers were swept by the Celtics in the first round of the playoffs.