Woltemade has been superb for Newcastle since his arrival from Stuttgart, though Wirtz has struggled with Liverpool after joining from Bayer Leverkusen.
After Germany's World Cup qualifying win against Northern Ireland, Raum said: “They’re amazing players. They both have amazing abilities.
“Florian has not had the best start at Liverpool I know but he’s working hard at training and always stays long on the pitch.
“I’m sure he’s going to make his way at Liverpool and he’ll be an important player this season for me.
“Nick is already scoring for Newcastle and I’m happy to play with both of them.
“I’m very happy for Nick. He’ll keep going and scoring for Newcastle. He’ll grow there and I hope he’ll become an even better player there because we’ll need him.”