Juventus are said to have already turned down an £11million bid from Bayern, while Arsenal are also believed to be in pursuit of the 19-year-old.
Vidal is hopeful he will be reunited with his teammate at the Allianz Arena.
"Coman isn't just young and quick," Vidal told Bild.
"He's also a great player in terms of his quality.
"He has tremendous potential for improvement, and if he were to follow me here it'd be a big help for Bayern."