It’s hard not to watch the video below without feeling a bit like a peeping tom.
And yet, footage was recorded at Valencia training on Monday showing Diego Alves and Ruben Vezo having a confrontation.
The video was shot looking through a tiny crack in the curtain, which was just enough to make out what was happening.
The players were seen grappling, and then being separated by teammates.
They were clearly not happy with each other.
Gary Neville was also seen on the training pitch.
The incident comes after Athletic Bilbao thumped Los Che 3-0 at the Mestalla over the weekend to end a run of four wins.