Matic, Mata and Lee Grant all started preseason from the first day this summer.
Matic told manutd.com: "Fantastic people and players. As you know, Juan is the magician. The kids can learn a lot from him on the football pitch and outside the pitch.
"You know him very well, he has already been here eight years and he's just amazing. Lee also, I'm really happy for him that he's signed a new deal, especially when you see how fit he is and how he trains. He deserves everything good.
"As I said, the young players can learn a lot from them and me also. From everyone you learn, and they are both fantastic people and everyone at United is very happy that we have them in our team."
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