I'd be very surprised if there was. Usually a great deal of self-belief is part of what gets a footballer to the level they're at. If Tony Watt were to be offered a great deal by Everton, for example (and we know he won't but let's say for the sake of discussion they come in for him) he'll most likely think he's good enough if given the opportunity at that level.
If anything most footballers are somewhat delusional when it comes to how good they really are.