Keane said on the Stick To Football podcast: "Show another side to yourself.
"If you have got question marks over this player, he is not training properly, but he does turn around and show some sort of humility and goes: 'Yeah, I think I got it wrong.' I do think you can move on very quickly.
"We have been in dressing rooms where players have made mistakes and they do say sorry and it is forgotten about [like that]. Football dressing rooms are a strange dynamic, if players show that they care and are human, you go: 'That's fine' and move on very, very quickly."