A Premier League debut is a daunting prospect for even the most seasoned professional footballers.
The intensity of the league, the expectation of the fans, the scrutiny on social media: all of it can weigh heavy on new players' shoulders.
And there have been plenty of disastrous debuts for those unprepared or simply overawed by the occasion.
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In light of Joao Felix's nightmare debut on Thursday, here are 11 of the worst debuts in the division's history.