Bernd Leno has been forced to wear Arsenal's outfield away kit in Sunday evening's clash with Wolverhampton Wanderers at the Emirates Stadium.
Leno would usually wear a luminous green shirt, but Wolves goalkeeper Rui Patricio wears a practically identical coloured jersey - meaning the Gunners man was forced to change.
This is to do with the Premier League rules, which state that goalkeeper kits are not allowed to be the same colour, despite the two men being on opposite ends of the pitch and very rarely coming into close contact with each other.
Usually this would be Wolves' problem - as they're the visitors to the Emirates - but the Midlands-based side did not have any back-up shirts in a different colour, and instead Arsenal were required to make the change.
This has unsurprisingly caused some confusion amongst Arsenal supporters, who weren't quite sure why Leno was wearing their away kit in north London.
For the Gunners, it's a huge game against Wolves following a drop-off in performance levels and results in recent weeks, which has left them winless in the last two matches.
Since beating Manchester United 1-0 at Old Trafford, Mikel Arteta's side have been beaten by Aston Villa, and then drew 0-0 with Leeds United last weekend.
The Gunners have been in impressive form in the Europa League, meaning supporters have had something to cheer about recently.
Speaking before the game, Roy Keane explained to Sky Sports that it was a big night for Arsenal, who need to improve as we enter the hectic Christmas schedule.
Keane said: “They need to do better. Talk is cheap. Everyone was praising Arsenal. It was a decent performance when they beat United, but even on the day, I thought United were so poor.
"The lack of goals is amazing, really, when you think of some of the attacking players Arsenal have got. Lack of quality, it’s a big night for Arsenal. They need to start showing up.”
