"As a player, you move on," Phelan told Manchester United Radio. "You've tried your best, it didn't work, now you have to move on."
Although United's stars are encouraged to look ahead after poor performances, Phelan admits the Reds' coaching staff have analysed in detail what went wrong at the Reebok Stadium.
"As part of the coaching staff, you dissect it in more detail and perhaps you even find more faults than you want to find. Sometimes that's a healthy thing to do and sometimes it's not.
"You can't change what's already happened but we do want to improve now. We want to go on another big run and there are ways of doing that. The first step is to make sure the players are focussed on the next game."