Manchester United's security plans were again called into question as it emerged that two foreign students were left sleeping at Old Trafford ahead of the Arsenal clash.
During the 2015-16 season the Red Devils were left red-faced by a bomb threat that turned out to be a device left in the stadium from an early security drill.
And on Saturday there was another breach due to a pair of intrepid supporters who apparently absconded from Friday's tour in the hope of seeing the weekend match.
The unnamed individuals decided to sleep overnight in Old Trafford, braving temperatures as low as 2°C and evading detection.
"We realise people will go to any lengths to watch a game at Old Trafford but these people went too far," a United spokesman told the Daily Mail.
"The fact that they and their belongings had been searched before entry means we are confident there was no risk to safety."
The pair were eventually discovered in Old Trafford toilets on the morning of the match, which finished 1-1, and the club called police who declined to take them into custody.