Arsenal boss Arsene Wenger expects a major test tonight against Wigan Athletic.
Wenger admits he has been impressed with Wigan's recent form in which they lost narrowly to Chelsea and then beat Manchester United 1-0 in midweek at the DW Stadium.
Wenger said: "They played well at Chelsea and were unlucky with the decisions. But when the players feel deeply that they have shown quality, they never give up.
"That is the impression they got out of the Chelsea game because they played well and showed it again against Manchester United.
"Victor Moses is a threat. They are solid at the back now with three centre backs and two protective midfielders. Overall I believe it is a team which is well balanced.
"Any team who fights not to go down finds some momentum. Every year they find it just before they are out of the league. They have found a structure of the team that is better suited for them maybe than before."