Arsenal manager Mikel Arteta has admitted facing Liverpool at Anfield is the toughest opponent he has encountered during his career in the professional game.
The former Everton and Arsenal midfielder has visited Anfield as both a player and a manager and was part of the Gunners' side that was defeated 5-1 by the Reds in February 2014.
Speaking to Jamie Carragher in a series of quick-fire questions, the 40-year-old admitted that visiting Anfield as an opponent was the most "difficult" enemy he had faced.