England duo Raheem Sterling and Danny Rose were apparently racially abused in Montenegro during their Euro 2020 qualifier.
Sterling made a gesture with his ears towards the Montenegro fans after scoring in the Three Lions' 5-1 win and there were monkey chants aimed at Rose towards the end.
Sterling later tweeted in response to the alleged racist chanting: "Best way to silence the haters (and yeah I mean racists) #2019 #getsomeeducation"
"Firstly, very sad," manager Gareth Southgate said at the post-match press conference.
"We had an excellent performance and we've got an 18-year-old being interviewed after the game and he's having to respond to what's happened when his evening should be about the joy of his full debut.
"I didn't hear (anything) during the early part of the game, but I'm told there were things in the early part of the game as well.
"But I certainly heard when Danny Rose was booked and it's unacceptable. I've spoken to our players individually. We've got to support them. We will report it.
"But I think that reporting is already in place because so many people in other areas of the ground have heard it. I believe the UEFA delegate also heard it.
"So, our part will be to make sure that process is followed, but more importantly for me is that the players in the dressing room know that as a group of staff and as an organisation we're there for them. That's the most important thing."