He returned to Chapel Hill with the team last evening and was evaluated again by UNC doctors on Wednesday afternoon.
Hairston's status for Saturday's game against Virginia Tech is "doubtful." A decision on whether or not he plays against the Hokies will not be made until Saturday morning.
"We're certainly pleased that P.J. is feeling better, but it is unlikely that he will play on Saturday," says UNC athletics trainer Chris Hirth.
The Greensboro native went 4 for 4 from three-point range against the Eagles and has made 12 of 18 three-pointers in the Tar Heels' last three games. For the season, Hairston is third on the team in scoring at 12.4 points per game and is second in three-pointers made with 43.