A summer buy from Arsenal, Mannone has become a firm favourite with the fans since taking over the gloves from the injured Keiren Westwood in November.
Poyet said; “Vito is a great story – one of the stories of the season.
“He came here, didn’t think he would play, thought that Westie [Westwood] would be the number one.
“Then there was a change of manager and Westie’s got injured against Hull in November.
“The only decision I had to make was in the next league game against Man City, when Westie was fit to play, even though he wasn’t quite 100%.
“But Vito had played well in the second half against Hull and against Southampton in the cup.
“In a different situation, maybe Westie would have played against Man City, but I decided to stick with Vito and he has never looked back.
“He is one of the success stories of the season.”