Lewis is regarded as one of the club's best young talents and already a first choice for Northern Ireland.
“He made me feel like I was his first choice when he came in and that gave me a world of confidence," he told the The United Stand. “You can then show what you can do.
“As a young player you can play simple, because you don't want to make a mistake in front of your team-mates and just want to get through the game, but when you have the type of manager who pushes you then you are not afraid to make those mistakes and you can shine.
“He is great with the young boys.
“He can lose his temper when we are not performing at the level he knows we are capable of, but you understand that."