Former Manchester United boss Louis van Gaal has taken aim at Jose Mourinho and Ole Gunnar Solskjaer over their lack of support for the club's young players.
Van Gaal handed Marcus Rashford a debut during his time in charge.
He told BBC Sport: "I read something from Mourinho saying I only did that out of necessity. Not true. I created the necessity.
"Manchester United had over 30 players. I brought them back to 23. Then I had an open selection for the youth academy. I did that at every club. That is why a lot of young players have made their debuts with me.
"A lot of trainers, like Mourinho, never give youngsters a chance. Yes, five minutes. Solskjaer, 10 minutes. That is not a chance. A chance is a game.
"Too much experience is not good. Then you have an automatic pilot. You always need imagination and you cannot forget how inspiring young players can be.
"If you are not willing to trust young players, you are not suitable to be a manager of a club with a youth education."