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McTominay's senior debut for Manchester United occurred in May 2017. The Scottish midfielder, who joined the club's academy at the age of 12, made his first-team appearance as a substitute in a Europa League match against Zorya Luhansk. McTominay's impressive performance in that game earned him a starting role in the subsequent Premier League fixture against Arsenal, where he played a pivotal role in United's 2-0 victory.