Peterborough boss Ferguson tipping Man Utd kid Tunnicliffe for big things
Tunnicliffe is impressing on-loan with the Posh.
"He's very highly thought of at United and has a big future in the game," said Ferguson.
"He can play on the left or right of the diamond and he could also play in Grant McCann's position so I expect him to make a big impact with us.
"The Championship is a tough league, but Ryan has the ability and the attitude to do well in it."