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Manchester United face arguably their biggest game of the season this week. The trip to Celta Vigo for the first leg of their Europa League semifinal is the next step on their "road less travelled" route into the Champions League that would mean they could still afford to finish outside of the top four.
Playing a team currently 11th in La Liga is not something that would usually worry Jose Mourinho. The issue, though, is that he could have to do it with just 14 senior outfield players -- not one of whom is a recognised centre-back.