“Ruben Amorim has faced a range of clubs during his first six games as Manchester United head coach, from Arsenal in the Premier League to Bodo/Glimt in the Europa League. Those six matches have brought positives, negatives and mixed results, but his opponents on Sunday, Manchester City, will pose a different challenge. Pep Guardiola’s side go into the game at the Etihad looking a shadow of their dominant selves, winners of the past four Premier League titles, but derby days are different, even if Amorim is playing down its significance.