Megson said: "We move on. Joey is a good player and a former England international.
"But he has certainly had his problems. There is an amount we would go to and that's it. We would not go any further."
Bolton were only able to name four substitutes for their trip to the Emirates on Saturday but Megson claimed they had no more bodies to fill the bench.
"We haven't got any more," he said. "We haven't got any other players. When I came to the club just over a year ago we had 29, and one of those 29 was probably the best centre-forward in the country (Nicolas Anelka) but we had five points from 10 games , so it is not about the players you've got, but the quality of the 11 you put out week in, week out and we've had to do something about it."
Meanwhile Megson's problems are mounting ahead of the meeting with Manchester United on Saturday even though Megson had warned he would have to wrap his players in "cotton wool" throughout the week because they could not afford to lose any more players.
Gavin McCann broke a toe in the 1-0 defeat by Arsenal at the weekend while Johan Elmander (hamstring) and Nicky Hunt (foot) are also receiving treatment for injuries.