The 25-year old goalkeeper played a full 90 minutes in Friday's 2-0 loss to Chile at Wembley and Lennon suggests the former Newcastle United man playing for the Three Lions has been one of his biggest achievements as manager of the Hoops.
"For me this is probably one of the best things I've been involved in as a manager. He was third choice at Newcastle when he came and now he is playing for England," Lennon said.
"He's worked tirelessly on his game and what I've always liked about him is his presence. We have worked and worked on his agility and for a big man he really fills the goal.
"When he makes saves he gets those big arms out and the ball is batted away. His performances in the Champions League are one of the main reasons why we have been so successful in the last couple of years."
"I'm delighted Roy did give him the opportunity although I don't think he could have done anything about either of the goals," he added.
"I don't want it to be a short-term thing for him either. I want him to be knocking on Joe for the next three or four years."
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball