The third-choice goalkeeper for Man United,  Jose Mourinho and will make his first start against Crystal Palace on Sunday.                                   The 20-year-old has already tasted the first-team environment at Manchester United once before when replacing Sergio Romero for the final 10 minutes of January’s 4-0 FA Cup win over Wigan Athletic, but Sunday’s Premier League finale against Crystal Palace will mark his full debut at a time when the spotlight is on amidst rumours that De Gea could soon finalise a protracted move to Real Madrid.                                                                                                                                                                                                                                  We have two fantastic goalkeepers, and we have a third goalkeeper that I think will be the best Portuguese goalkeeper of the next generation,” said Jose Mourinho earlier this month that David de Gea and Sergio Romero. On Sunday, Joel Pereira gets his chance to show just how good he can be. As United fans begin to wonder who might be their club’s long-term No.1, Pereira has seen his position at the club change markedly over the last couple of years. The Swiss-born Portuguese spent the first half of 2015-16 on loan at Rochdale, where he made his first eight senior appearances. While he only kept one clean sheet at Spotland, he left a great impression on many at the club.