Everton chief David Moyes defended his team selection after the Toffees were dumped out of the third round.
Gary McDonald's first-half strike gave League One side Oldham a famous giant killing, but Moyes had rested several big hitters ahead of Tuesday's Carling Cup semi-final first leg at Chelsea.
Moyes said: "We have a very good squad, we picked a side who have all played at the top level, they have all played in Europe this season, it was very much the midfield that played and won away to Alkmaar in the UEFA Cup."
He added: "It wasn't a vastly weakened team at all, in fact I felt it was a strong team.
"I would have expected that the team I put out would have been good enough to win.
"They are all disappointed, we all are. These things happen, unfortunately it has happened to us a few times."