Manchester City captain Kyle Walker confronted referee Michael Oliver in the tunnel after his side's 2-2 draw against Arsenal, it has been reported.
Walker was restored to the team for the match, having started only one of City's opening four Premier League matches.
It was a challenging afternoon for the 34-year-old, who was not on the winning side and lost goalscorer Gabriel Magalhaes in the build-up to Arsenal's second goal.
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Walker could be seen on camera blaming himself for the goal, having swapped with Jeremy Doku in order to mark the Brazilian centre-back.
But he was also furious with Oliver in the lead-up to Arsenal's first goal, which saw Riccardo Calafiori score a stunning left-footed strike from under 25 yards out.
Sky cameras missed that an Arsenal free kick had been taken quickly in the build-up, which caught out the City defence and therefore left them out of position.
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Although there was ruled to be no infringement, City players were still far from happy.
And according to BBC Sport's Simon Stone, Walker confronted Oliver in the tunnel at half-time and 'made his point' over the incident.
City players had earlier surrounded the referee immediately after Calafiori's goal went in.
Speaking to BBC Radio 5 Live after the match, Walker explained his on-pitch discussion with the referee: "I've not gone over to the referee. Me and Bukayo Saka have not gone over to the referee. He's called us over.
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"So if I'm being called over to the referee, he then should wait and allow me to get back in position before the ball is then gone over my head.
"Me and Mike have a very good relationship and I think he has a very good job. So that's not me being critical of him. I know he has a hard enough job.
"If he calls me over, if I go over of my own accord, fair enough [to restart].
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"But for him to call both captains over, and then not let me get back in position... if was a goalkeeper, does he let me get back in my net? Of course. I'm a defender, I'm the first line of defence. He should let me get back in and be set, and then blow the whistle."
Topics: Manchester City, Arsenal, Football, Kyle Walker, Michael Oliver, Premier League