Jared Sullinger has been bothered by foul trouble during the NCAA tournament.

Sullinger said unfamiliarity with the referees -- officials from different conferences are assigned to NCAA Tournament games -- can hinder a player early because of the uncertainty about how a game will be called.

“You have to adjust your game,” Sullinger said. “It can take away from your aggressiveness if you let it. You see referees you don’t know, and in the first four minutes you think, ‘Should I do this or that?’

“You start thinking and then you miss shots you shouldn’t miss or miss defensive assignments. You’ve got to stay focused and play aggressively.”