Hannover have signed Norway international Henning Hauger on a four-year contract, while Polish striker Artur Sobiech has also joined the Bundesliga club.
Hauger, 25, has moved to Germany in a deal worth a reported €450,000 (£406,500) to former club Stabaek and he will link up with compatriot Mohammed Adellaoue at awd-Arena.
Sobiech, 21, has signed a three-year deal at Hannover after leaving Polonia Warszaw for a reported £1.1million fee.
Hannover manager Mirko Slomka told his club's official website: "We have signed a striker in Artur Sobiech who will hand us strengths with his qualities as a sound and strong striker.
"This will enrich our options up front. I feel he is a player with a very good future in the game."