Arsenal winger Theo Walcott reportedly swapped shirts with Manchester United striker Robin van Persie away from supporters following Sunday's clash.
The Gunners fans were left reeling when Andre Santos asked for former Arsenal captain Van Persie's shirt in front of TV cameras and supporters at Old Trafford earlier this season.
While Walcott was spotted doing a TV interview wearing the Dutchman's United shirt, it is believed that the pair made the exchange in the tunnel, according to the Daily Mail.
The swap occurred after Arsenal relinquished two points due to a converted penalty by Van Persie, as the game ended in a 1-1 draw at the Emirates Stadium.