Arsenal defender Laurent Koscielny admits that last week was one of the worst he has experienced in football.
The pressure has grown on Arsene Wenger after the Gunners followed up their League Cup final defeat to Manchester City by losing 3-0 to Pep Guardiola's team and 2-1 at Brighton in the Premier League.
Koscielny accepts that a top-four finish in the Premier League is probably beyond Arsenal this season, as focus turns to Thursday's Europa League round of 16 first leg encounter against AC Milan.
The French defender has called for unity among the players and supporters after Arsenal slipped 13 points behind fourth-placed Tottenham.
Koscielny said: "It will be very hard to finish in the top four. We have had a bad period and have not had the results we wanted.
"We lost our confidence a little bit and on the pitch we haven't had the confidence we need to push ourselves more and to play well with the ball.
"We need to fight together. It is a big period for us. We know it is difficult but you need to put your head down and work every day."
Asked if he had experienced a period as bad as last week's before, the 32-year-old added: "No, no. I think it has been difficult for everyone, maybe the first time for all of them.
"We need to get back, train hard, work hard and then the results can come back and give us more confidence for the rest of the season."
Arsenal can be backed at 29/10 to beat AC Milan at the San Siro on Thursday and at 10/3 to keep a clean sheet against the Rossoneri. The Gunners are 9/1 to score a penalty in the first leg and 12121/1 to win the Europa League outright.
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