A seemingly innocuous piece of shirt swapping could have serious repercussions for one South American player - and highlights the importance of local derbies in his continent's football.
In an Argentine league game last weekend, Gimnasia striker Luciano Leguizamon exchanged jerseys with Juan Sebastian Veron, once of Manchester United and Chelsea but now back at his original club Estudiantes. As a consequence of this action, Leguizamon was not considered for selection for the club's next game, played last Friday night, and there has even been speculation he might have his contract torn up.
His problem is that the Gimnasia-Estudiantes match is the big derby of the city of La Plata, its rivalry nurtured by decades of tradition.
To make things worse for him, this gesture of sporting cordiality did not take place with any old Estudiantes player but one who is a veritable symbol of Gimnasia's long term rivals - Veron's father also played with great distinction for Estudiantes. And to cap it all, Gimnasia lost the game.
Veron proclaimed himself bemused by the scorn that fell on Leguizamon. He attacked the hysteria surrounding the incident, which he said could only worsen Argentina's serious problem of football violence.