Arsenal will be hoping to make full use of their home advantage tonight in order to reach the next stage of the FA Cup.
But ahead of the clash, manager Unai Emery has warned Manchester United are now a “different team” and are incredible capable.
He said: “It’s a different team. It’s the same players but they’re playing with a big performance now.
“I was watching their last matches and each player has a lot of confidence, with big performances, and now they are very dangerous.
“For us, it’s good because it’s a very big test for us in this competition.”
Ole Gunnar Solskjaer has launched Manchester United into sixth place in Premier League standings since he took over as caretaker manager.
In fact, the club now sit on 44 points, the same as Arsenal.
Before the tie tonight, Solskjaer was eager to reminisce about the long-standing rivalry between the two sides.
He remarked: “That’s the one fierce football rivalry of my years here as a player.
“We were always the closest rivals. They won the double, we won the treble. The games were just fantastic.
“We had a great team, and they had a very good team. There were some tackles flying in between the two teams. They were fantastic games.”
How to watch Arsenal vs Man Utd
Arsenal will host Manchester United at the Emirates Stadium tonight with kick-off taking place at 7.55pm.
However, BBC One will be hosting coverage from 7.30pm.
That means you can watch all the action online using iPlayer.
The service can be accessed online or through BBC’s iPlayer app for Android or iOS.
It is also worth noting iPlayer is also available on a number of other devices such as PlayStation 4 and Xbox One consoles, in addition to streaming sticks and boxes.
Consuming such content is free for anyone in the UK with a TV licence.
It is illegal to watch tonight’s game if you do not have one.