Everton boss David Moyes has warned his players they will not be given any extra time off if they play in the Olympics this summer.
Stuart Pearce is on charge of the Great Britain Olympic squad which will mainly be an under-23 side with three over-aged players allowed in it.
Moyes is worried that his players will be overstretched and has warned them they will not be given any extra time off, unlike those involved in the Euro 2012 finals.
"Quite a lot of our players have had letters of invitation," said Moyes.
"Am I worried? I am because there's a lot of them got all sorts of things going on over the summer so I am a bit worried about the whole thing.
"It's a real difficult one. It would be hard to say to players not to but in the same breath, this (Everton) is their bread and butter and this is where they get paid.
"They do need holidays and they can't then be asking for spare time off that doesn't fit in.
"If they say 'I'm playing in the Olympics then I might need a week off to recover', there can never be anything like that."
Moyes added in the Liverpool Echo: "We accept international tournaments.
"What we're willing to do to those boys is give them a bit of extra time off because the players definitely need a holiday.
"But I think the players going to the Olympics will have to consider their own holiday time and it couldn't be eaten into the club's time."