The Gunners' season is on the brink of collapse after their surrender of a five-point lead at the Barclays Premier League summit was followed by Tuesday's exit from Europe.

Only victory against Manchester United on Sunday will revive their hopes of avoiding a third successive campaign without silverware.

Crippling form of just two victories from 12 games has prompted criticism of the once untouchable Wenger, but the Arsenal boss' self-belief remains intact.

"It doesn't worry me. I don't mind that I'm questioned. I would prefer that I'm questioned rather than the players," he said.

"I can handle that. I have to accept it. I'm in a position where you have to accept being criticised.

"My position is not my problem or worry. My only worry is to be at my best every day and to act as if I will spend the rest of my life here at the club."

Arsenal must prevail at Old Trafford if they are to retain any chance of reeling in leaders United.

Sir Alex Ferguson's side lie six points ahead with five games remaining and Wenger claims that to edge his old rival in the title race from this position would be his finest moment.

But the Frenchman also knows that failure against United will effectively spell the end of Arsenal's season.

"It will be the greatest achievement of my career to win the Premiership now because we are swimming against the stream at the moment," he said.

"But I still believe this team can produce it. For us the game on Sunday is the game of the season. If we do not win this game we have no chance.

"I can't understand people who say the team's season is over. Why is it over? We are not too far behind.

"It depends on what happens on Sunday. If we win then we can win the title and that's what is important for us to focus on.

"What is at stake on Sunday is the work of a whole year. If we go there and don't believe in ourselves then it is over.

"But do you really think that we will go to Manchester United thinking that our season is over? That would be ridiculous.

"We have worked so hard since the first day of the season and we will fight until the last second of the championship."

Arsenal were left reeling by their painful 4-2 defeat by Liverpool on Tuesday night, a result which ended their participation in the Champions League.

A dubious late penalty contributed to the Gunners' downfall at Anfield and skipper William Gallas later admitted morale at the Emirates had been hit.

But Wenger has warned United his players are determined to bounce back at Old Trafford, the setting for Arsenal's 4-0 FA Cup drubbing in February.

"This is where you see the winners and losers. The winners continue to believe and fight even stronger when the others stop and that's what we have to do," he said.

"It was a big blow to lose on Tuesday but we are focused, ready to fight and make life hard for Manchester United.

"I believe we have the strength and desire to respond. Of course it is at Old Trafford but maybe that's good for us. I'm sure we can beat United."