Centre-back Chris Smalling believes Jose Mourinho has instilled a defensive solidity at Manchester United after they recorded their 14th clean sheet of the Premier League season at Burnley.
United are yet to concede a goal in 2018 and have gone 504 minutes since last conceding when Burnley midfielder Steven Defour's free-kick beat David de Gea on Boxing Day.
So while all the talk surrounding United has been about the expected arrival of Alexis Sanchez, an attacker, it is their diligent work at the other end that is keeping them at the head of the pack chasing leaders Manchester City.