Laurent Koscielny has conceded Arsenal are unlikely to finish in the top four this season following their fourth consecutive defeat.
The Gunners were beaten 2-1 by Brighton on Sunday, a result that leaves them 13 points off the top four.
Speaking after their eighth defeat in their last 13 matches, Koscielny said: "It will be very hard to finish in the top four. We have (had) a bad period and did not have the results we wanted.
"We lost our confidence a little bit and on the pitch we didn't have the confidence we needed to push ourselves more and to play well with the ball.
"We need to stay together, 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.
"We need to win to have more freedom on the pitch and we need to stay together because it is a bad period but all the players, staff and fans need to know that we are all together.
"It is important to have everyone behind us."