The Switzerland international joined the German outfit on-loan in January.
"Johan and his family are really good in Hannover. 96's project fits very well with Johan. In the coming days we'll have a chat with Mr Schmadtke (sports executive).
"In England, clubs are waiting to plan for their squad, but Johan would like to be clear about where he plays next season before the holidays," agent Marco Lichtsteiner told BILD.