Hannover have confirmed Christian Schulz, Karim Haggui, Sofian Chahed and Markus Miller have signed new deals.
Defender Christian Schulz is poised to snub a move to Wolfsburg and pen a new deal at Hannover.
Hannover have denied receiving any bids for in-demand defender Christian Schulz.
Konstantin Rausch has ended speculation over his future by signing a new contract extension.
Fulham midfielder Leon Andreasen has admitted he could imagine playing for Hannover.