Metzelder signed a three-year contract with Schalke when he joined the club from Real Madrid earlier this summer.
Metzelder believes Raul will now join him in Gelsenkirchen.
“I understand him, I used to sit next to him on the Madrid team bus,” Metzelder told Bild newspaper.
“Raul has the ambition to continue playing in the Champions League and is thinking seriously about Schalke.
“He has even been told which teams his sons will play in.”
“He is in top shape,” he added. “He was injured only once in my three years at Madrid.
“He has a great personality and his presence would be a huge boost for this young team.”
