David Seaman has warned Arsenal that they must beat Manchester United when the two sides meet at the Emirates Stadium on Sunday afternoon.

The Gunners go into the clash three points adrift of Louis van Gaal's visitors, who sit top of the Premier League table with seven matches played.

Having lost 3-2 to Olympiacos in the Champions League on Tuesday, former goalkeeper Seaman has insisted that it is vital Arsenal bounce back against the league leaders.

"It's a massive game against Man United. This is a must-win game for Arsenal. It's a big, big game and Arsenal need to win it more than Man United," the 52-year-old said in a video on BreatheSport.

Of the last nine encounters between the rivals, the North Londoners have come out on top just once.