WATCH: Middlesbrough and Manchester United players scuffle
Last Updated: 19/03/17 7:46pm
Tempers flared towards the end of Manchester United's 3-1 win over Middlesbrough on Sunday and the scuffle appeared to continue down the tunnel.
Rudy Gestede and Eric Bailly were the initial protagonists as they appeared to clash as they waited for a Middlesbrough free-kick towards the end of the game.
The striker looked to have his hands around Bailly's neck before other players got involved.
Referee Jon Moss did not hand out any punishment but the tension appeared to spill over into the tunnel after the full-time whistle.
Mourinho did not answer when later asked what had happened, but Boro's interim head coach Steve Agnew played down the incident.
Agnew said: "I've been asked that - and I was in early - I didn't see anything. Obviously I'm picking up now that there's something gone on in the tunnel, but this group of players are so determined to start winning football matches that it's no concern to me."
Gestede played down his own spat with Bailly, insisting that - despite what his team-mate Ben Gibson had thought - the Manchester United man did not attempt to bite him.
"He gave me a hug and a kiss, that's it. I didn't feel anything."
Hit play on the video at the top of the page to see how things nearly boiled over at the Riverside.