Lewis was coached by Gerrard with the U18s last season.
He told liverpoolfc.com: "I've said it many times but it was just like a dream come true. Being captain under him is something you dream of as a boy and I've done that. His support for me was massive. When I got sent off against Manchester United, he pulled me to one side and told me he had made that mistake when he was a player and said just to get on with it.
"Since then I've been the best I've been. I will miss Steven but I know I've got Critch, Alex [Inglethorpe], Tim [Jenkins] and all of the coaches there for me and to help me. Critch is one of the best managers in the Academy and that's why he has got the U23s job."
On Rangers, he added: "I'm quite close to Ovie Ejaria and Ryan Kent and I want them to do well. We always watch the games now at home and we are all massive Rangers fans now as well as Liverpool! I didn't watch them before but now we do because of Steven!"