Manchester United fans were left baffled after Tom Heaton was finally given his United debut as a substitute in the Champions League clash with Young Boys - almost 20 years after he first joined the club.The 35-year-old replaced Dean Henderson in the 68th minute of the European clash with the scores level at 1-1.Much had been made of Ralf Rangnick including a host of United's most promising young players for the game, with a few of them expected to be given their United bow.But instead, fans were left scratching their hands as Heaton, who started his career at Old Trafford but left without making a senior appearance, was sent on by Rangnick.And his cameo had United fans online in uproar.One fan tweeted: "Heaton lmfao.
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