United manager Fergie praised the young Scot after the match.
Kean said: "He was very complimentary about Grant. He thinks he's good enough to play for Scotland for the next 10 to 15 years, and I agree.
"I hope Fergie's not going to be putting a bid in. I said that to him.
"I told him leave it a bit longer because Grant is only just starting with us."