Young, who hopes to be fit to face Valencia's former club Wigan Athletic on Saturday, was not surprised that the Ecuadorian was voted United’s double Player of the Year in 2011/12.
When asked by Inside United what made Valencia so effective, Young said: "Last season he had everything.
"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."
Valencia, who will face Wigan for the fifth time as a United player if he features this weekend, also earned plaudits from his manager.
"Antonio is always very professional and a great human being. I'm very happy with him," said Sir Alex this week.
"He’s one of those players who is constantly maturing. Without doubt, his best position is wide right – he’s fantastic there."