Manchester United boss Ole Gunnar Solskjaer said his players "don't have to be best friends" and is happy to see some aggression between them in training.
Per Jack Gaughan of the Daily Mail, the Norwegian wants his players to push each other and breed a winning mentality in the squad.
Solskjaer said:
"I've already noticed that they are very well knitted together. It's a fantastic atmosphere, which is one of the foundations for any team.
"You don't have to be best friends. The team spirit is great. We had one or two fights [as a player], but that is just the demand, the standards that you set.