Thierry Henry is thought to have clashed with an Arsenal fan after their 3-2 defeat at Swansea City.
The striker appeared to beckon a fan towards him after the final whistle.
The Frenchman later told Gunners officials that he wanted to talk to the supporter after they had expressed their unhappiness over the team's performance.
The Los Angeles Galaxy forward is on a two-month loan with his former club during the MLS off-season.