While Grealish has often operated from wide areas for both club and country, Hamann believes his best performances have come when deployed in a central playmaking role.
"The question at Bayern would be where he plays, I think he is at his best just behind the centre forward as a number 10 even though he has played a lot out wide, but he was outstanding there for England against Ireland," he added.
"Bayern do have Jamal Musiala there, but I think he is a player that you have to put in his best position because he is that good. It’s also a question of if they are able to afford him, but he would bring flair to the Bundesliga for sure."