Following Maradona's death last week, Messi paid tribute to his countryman over the weekend when he celebrated his goal during Barcelona's 4-0 win over Osasuna by revealing the legendary No. 10's old Newell's Old Boys jersey under his own.
The 33-year-old's gesture was widely applauded around the football world and created some of modern football's most iconic imagery, but could now land his club in a bit of hot water for breaching the RFEF Disciplinary Code.
"The footballer who, on the occasion of having scored a goal or for any other cause derived from the vicissitudes of the game, raises his shirt and displays any kind of advertising, slogan, legend, acronym, anagrams or drawings, whatever its contents or the purpose of the action, will be sanctioned, as the author of a serious offence, with a fine of up to 3,000 euros and a warning."