Gianfranco Zola maintains players must be patient for their chance with West Ham - but accepts some may opt to find first-team football elsewhere.
The Barclays Premier League club have already seen unsettled striker Craig Bellamy make a high-profile move to Manchester City.
"In football, things change so quickly. It is a dynamic system," said the Hammers boss. "Jack Collison was about to leave this team and go on loan to a team in a lower division, then we played Manchester United away and he played well. Since then, he has not left the club and is now playing on a regular basis in the team."
He added: "I do not have a problem with Julien (Faubert). Right now he is not playing, but every time he plays he does well and maybe in a month's time he might be playing regularly.
"The important thing is that when the moment comes for you, you have to be ready to take it."
Zola, though, will not try to keep anyone at Upton Park if their mind is set on a move elsewhere.
"As far as I am concerned, people are happy to stay, but if someone wants to go and play, we will consider it," he said.
"To be successful you have to enjoy it and be committed and that is more important than having quality players who maybe do not want to stay."
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