David de Gea looking forlornly at the ground after a fumble resulted in a goal has become a familiar sight. The Manchester United goalkeeper was at fault for two of Chelsea's goals in <a href="https://www.thenational.ae/sport/football/nightmare-for-david-de-gea-as-chelsea-beat-manchester-united-in-fa-cup-semi-final-1.1051609">his side's 3-1 defeat</a> in the FA Cup semi-final at Wembley on Sunday. And the calls are growing louder for the Spaniard to be moved on. Just two years ago he was regarded as one of the world's best, a master in his penalty box with incredible reflexes and the ability to pull off remarkable saves with both hands and feet. Fast forward and he has become a liability, with soft goals slipping through his hands with regularity and questionable positioning leaving United's defence exposed. He may not be finished just yet - he''s only 29 after all. But the decline has been fast, and United's patience is surely wearing thin. Before de Gea there's been plenty of other keepers who slipped from being on top of their game to obscurity. Check out the slideshow at the top of the page. _____________