"I have heard nothing negative about Simon and there have been a lot of games since I have been here," says Klopp.
"As always with goalkeepers, he has been involved in one or two goals conceded but as the whole package he is perfect.
"He has to develop, but he gives his all to the team and it is a good feeling when he is in the starting line-up. We were sure we wanted to work with him for the next few years and that is why we offered him the new contract. He took it and is here for a long time."