"Jimmy Briand has quite a flexible profile, allowing him to play on the wing or through the middle of the attack," Dufner told the club's official website.
Briand has admitted that he is excited by the prospect of playing in the Bundesliga after spending the entirety of his career so far in France.
"The Bundesliga is a new experience for me, for which I am very pleased," the forward revealed. "I'm curious about playing in a league in the country of the world champions, after many years in the French Ligue 1."
Briand was restricted to just 20 appearances for Lyon last season.