The row over Antoine Griezmann's summer move from Atletico Madrid to Barcelona could lead to the Catalans being forced to play a game behind closed doors.
Atletico are determined not to let the matter of Griezmann's controversial summer switch lie , and remain adamant that Barcelona owe them more than the £107million they paid for the World Cup winner in the summer.
A release clause in Griezmann's contract set at that figure kicked in during the latter half of the summer transfer window, having previously stood at £178million.
The club from the Spanish capital are claiming that surplus £71million as they claim that the transfer had already been set up long before the lower release clause kicked in.
Griezmann was close to joining Barca in the summer of 2018, only to dramatically announce that he had decided to stay at Atletico.
Barca say that they have done nothing wrong, but Atletico's pursuit of the money has led to a Spanish Football Federation investigation, which is currently being overseen by a top judge.
Goal.com claim that one of the punishments that could be meted out to Barca is the closure of their stadium for a league game.
However, they add that the much more likely punishment would be a fine, and a meagre one at that.
If the possibility of a ban on supporters - something that would cost Barca thousands in terms of the loss of matchday revenue - is lifted, then the Catalan giants could settle the case for as little as €300.
Griezmann has made four appearances for Barca thus far, scoring twice in a 5-2 win over Valencia on his home debut last month.
Barca go to Dortmund in the Champions League on Tuesday, while Atletico host Juventus on Wednesday.
