Caretaker boss Tony Philliskirk has told Oldham to expect an Everton backlash when the sides meet in Tuesday night's FA Cup fifth round replay.
Oldham substitute Matt Smith headed a stoppage-time equaliser to earn the League One strugglers a replay at Goodison Park, with Wigan lying in wait for the winners.
Philliskirk expects David Moyes's side to be smarting from their last-gasp Premier League defeat to Norwich on Saturday - and warned his players their chance to spring a shock could be a fleeting one.
"We are under no illusions; it will be very, very tough," Philliskirk said.
"They had what David Moyes will consider to be a very disappointing result at Norwich. It will make Everton even more determined to put things right.
"Usually when you play Premier League clubs - and this is not me being defeatist - you get one chance.
"David gave us the utmost respect (in the first tie) and I'm sure he will in the replay. I wouldn't expect anything different. David's the ultimate professional.
"Obviously it's a massive game for Everton, a great opportunity for them. They'll be thinking about going on and getting a Wembley appearance if they get past us and they get past Wigan."