Neuer, 40, made the decision to come out of international retirement in order to help Germany at this summer’s World Cup.
He has displaced Oliver Baumann, who had expected to be the main man between the sticks for Julian Nagelsmann's side.
Germany will start their World Cup campaign against Curacao on Saturday (June 14), and striker Undav has backed Neuer to play a big role.
"Manu is always on the go. Manu talks a lot, even off the pitch. He commands respect," said the Germany striker.
"When he’s in goal, you can see it even in training – as a striker, you have to be a bit more precise with your shots.
"He’s one of the best goalkeepers of all time, but also a very calm man. When you talk to him, you can feel his experience and his understanding of football."