Arsenal manager Mikel Arteta has now called upon his players to do their “duty” when they face off against Manchester United on Sunday. Arsenal will travel to Old Trafford to take on Manchester United on Sunday in a fixture that could have huge ramifications in the Premier League title race. Whilst the Gunners are also relying on Manchester City dropping points between now and the end of the season, they must also ensure that they win their remaining two matches. Whilst Manchester United have been in poor form of late, Mikel Arteta cannot allow any complacency to set in amongst his squad. Give…