Roberto Martinez is sure that Wigan's next Premier League game at Arsenal will be a much tougher task than when they defeated Manchester United.
The Latics upset the Premier League leaders with a 1-0 victory at home on Wednesday evening thanks to Shaun Maloney's second half effort.
The victory was Wigan's first ever against United and lifted them two places up to 17th in the standings.
However, the Spanish boss feels the Monday night clash against third-placed Arsenal at Emirates Stadium - with the Gunners winners in nine of their last 10 league matches and their past seven at home in all competitions - is a more tricky proposition.
"Probably this is an even tougher task," Martinez said.
"We are going away from home and playing against a side which have been as successful as ever at home.
"If you look at the last few performances they have been untouchable in the way they are playing their football, controlling games and scoring goals.
"But we know that if we are at our best, we can be competitive against anyone."