Max Verstappen and Sergio Perez's disagreement at the Sao Paulo Grand Prix has left former world champion Jenson Button "amazed" over potential discord in the Red Bull garage.
The pair were involved in late drama during Sunday's race, when the Dutchman defied team orders and refused to cede a place to his team-mate in the closing stages at Interlagos.
Vertsappen, who has wrapped up a second consecutive drivers' championship already, denied Perez the chance to move second in the standings ahead of Ferrari's Charles Leclerc with his move.
The incident prompted cryptic but heated comments from both men, and now Button - who won the 2009 title with Brawn - has mused on the reasons behind their spat.
"I'm more amazed by [Perez's] comment, I love it, 'Shows who he really is'," Button said on the Sky Sports programme Any Driven Monday.
"It's a tricky one because we just hear one side of it, we don't hear what his reasons are.
"It doesn't come across well, and when you hear his comments saying 'No I'm not letting him past, I've got my reasons', if we don't hear the reasons we think Max is being selfish, he's not thinking about the team or his team-mate.
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"I did see something in the media, I don't know if it's factual, but I think he was very upset about the Monaco Grand Prix qualifying where [Perez] ended up in the wall.
"Maybe that's his reason for not wanting to give the place up, because it hurt his qualifying in Monaco and maybe he thought [Perez] found the wall easier than he should have."
A qualifying crash for Perez prevented a potential pole position for Verstappen in Monaco, where the Mexican ultimately went on to win.
It has been suggested the Dutchman's actions have been in response to that, though Perez has since respected team orders on multiple occasions to give his fellow Red Bull man a race advantage this season.