Reggie Jackson left during the fourth quarter of Sunday's game with what appeared to be a neck injury, The Oklahoman reports.

Jackson left during the fourth quarter of Sunday's game after colliding with Pacers center Ian Mahinmi, The Oklahoman reports.

Analysis:

Jackson walked back to the Thunder's locker room while holding his neck. The severity of the ailment is unclear at this point, but with fellow point guard Russell Westbrook (knee) slated to rest Monday, Derek Fisher could see even more minutes if Jackson misses any time. Expect more definitive news regarding Jackson's condition to surface shortly.