An almost unrecognisably callow Manchester United made life difficult for themselves against the footballing midgets of Midtjylland by going behind and then missing a series of chances, including a first-half penalty, before the day was saved by 18-year-old Marcus Rashford, a reserve who found out he was playing only a few minutes before kick-off. Rashford scored twice in the second half, both convincing close-range finishes, to complete an extraordinary day’s work and keep his side in Europe and his manager in a job, at least for a few more days. It was scarcely the most convincing United performance, yet that hardly mattered in the end. It was scarcely the most convincing United side, but Louis van Gaal clearly has some youthful promise at his disposal. Even Paul Scholes was enthusing about the win at full time, mainly because United had at last managed to increase their tempo and move the ball about with some of their old panache. Their evening began in the worst way. Already giving a first start to the left-back Joe Riley and playing Michael Carrick at centre-half because of the late withdrawal of Chris Smalling, the home side had to bring in the teenage debutant Rashford…