The Spaniard has come under scrutiny this season, particularly after his performance during United's 3-1 defeat by Chelsea in the FA Cup semi-final with goals from Olivier Giroud and Mason Mount coming following his errors.
"Henderson is 23, which for a goalkeeper is still very young, he's got a lot of football ahead of him, but you can see that he is hungry to play and I think the competition he could bring to De Gea could be the difference maker, or breaker. "It's the same with outfield players, when you think you are untouchable you make more mistakes because you are over-confident."