The 27-year-old, who arrived from Wigan in 2009, enjoyed arguably his best season at Old Trafford last term, winning the club's, fans' and players' Player of the Year awards.
And Young has insisted Valencia fully deserved the accolades and hailed his professionalism as the reason for his success.
"Last season he had everything," he told the club's official website.
"He attacks, he defends, he can shoot, he can cross, he can pass... he has it all and that's why he scooped up everything at the end-of-season awards. It's why the players voted for him and it's why the fans voted for him.
"He's fantastic to play with. Antonio, like every other player, knows how to look after himself as well – he knows what to eat, what to drink and he works closely with our fitness coaches."
Red Devils boss Sir Alex Ferguson was also was full of praise for the wideman and backed him to further improve this season.
"Antonio is always very professional and a great human being. I'm very happy with him," he said.
"He’s one of those players who is constantly maturing. Without doubt, his best position is wide right – he’s fantastic there."