Arsenal boss Mikel Arteta explains why Sheffield United will be a 'difficult test' for his side - and why he is 'impressed' by Chris Wilder's Blades

United travel south four points and four places in the table ahead of the Gunners, who they beat 1-0 at Bramall Lane last year.

And Arteta, who replaced Unai Emery in charge at the Emirates, admitted: “I've been very impressed [with United]. I've seen a lot of games and everything is prepared.

“Everything they do has a real sense, they are really difficult to break down. The solidarity in their team is incredible, how hard they work for each other and they have very clear principles - in attack and in defence, restarts of play, set-pieces - with what they want to do.

“So it will be a very difficult test. I already warned the players today.”