In an interview with the local media, Poyet is sure he's seen why he played for Manchester United for so long and had a successful career at Old Trafford.
The Republic of Ireland international has been hailed as 'scarily' fit along with Emmanuele Giaccherini, and it's one of the reason's why the duo have not been given a rest this season, Poyet said in an interview that appeared in the Shields Gazette.
Poyet had this say to about 33-year-old O'Shea, hailing him for his defensive work so far this season: “He’s been consistent all the way through this season.
“I understand why he played so many years at Man United now.
“I’ve got no doubt that if he was playing with better players than him, it would be very easy.
“If you put him in any team in the world and he was surrounded by better players, then he would be unbelievable.
“Now we’re asking him to do a lot. We’re asking him to be the leader, to mark and to play 90 minutes every game.”
Before moving to Sunderland, O'Shea won a total of five Premier League titles at Old Trafford, the FA Cup, the Champions League and three League Cups over a 12 year spell at the club before moving to the Stadium of Light, and was played in a variety of positions by Sir Alex Ferguson whenever, and wherever he was needed.
The objective is very different at Sunderland as they look to consolidate their position in the Premier League status where O'Shea is one of the more key players in the team. His experience, however, seems to be vital to the Black Cats moving forward.