Few clubs in world football can boast an unbeaten record against Barcelona.
Even Manchester United, who have toppled the Spanish giants three times in European competitions over the years, have suffered heartbreak at the feet of Lionel Messi in their last three meetings.
But as Ole Gunnar Solskjaer's side gear up for tonight's clash against Barcelona in the Champions League, something rather peculiar was found in the Nou Camp tunnel.
Nottingham Forest are one side who can say that they have never been beaten by Barca having got the better of them over two legs in 1984's UEFA Super Cup final.
But as reporters were gathering pitch side, in the very tunnel where Messi, Johan Cruyff and Diego Maradonna have all lined up in blue and red over the years, BBC 5 Live's Colin Murray found something of Forest interest.
Murray tweeted: "Just found the most random thing ever on the floor of the actual tunnel at the Nou Camp in Barcelona.
"Part of a cut up Nottingham Forest season ticket card! It’s a great mystery! I need to know why! Answers on a postcard."
The 2017/18 season ticket card, which had been cut into pieces and dropped on the floor, certainly caught the EFL on Quest presenter's eye.
But how did it get there?
Is Messi a City Ground regular?
Are Ernesto Valverde's side planning a summer swoop for Joao Carvalho?
Or was it dropped by a Forest supporter joining the hundreds of thousands of football fans who take a tour around the Nou Camp every year? Probably.
If you know anything, let us know!
