McManaman admits he was impressed with the England U21 star's form at the Stadium of Light last term, and is confident he can develop further under Kenny Dalglish's guidance.
"Jordan is a very promising young player and had a good season with Sunderland," he told liverpoolfc.tv.
"Like most good players I think playing in a better team will bring out better qualities in him. No disrespect to Sunderland but I expect a huge amount of improvement from Jordan. He's still young and has a lot of potential."