McTominay, who starred for Scotland in their Euro 2020 Group D draw with England, clashed with Neymar during Manchester United's Champions League clash against Paris Saint-Germain.
The French side won the game 3-1 at Old Trafford in December, with Neymar scoring twice.
Speaking to The Athletic, McTominay said: "He ended up grabbing me. You could see his head was gone for a moment in the way he was so aggressive.
"There was a lot of talking going on — words that your mum or dad might not like to hear.
"But that is part of the enjoyment of football, of competition. He's trying to beat me, and I'm trying to stop him.
"If you have to say certain things to people to take their eye off the game, then fair enough — that is the way it's going to be.
"That was the way that game was going with Neymar. But he is such an amazing player, he was really good in the second half, and for us, we have to pay him respect.
"He is possibly the most talented player I have played against. Just because you might have a bicker doesn't mean you don't have respect."