Norway international midfielder Havard Nordtveit has joined Hoffenheim from West Ham for an undisclosed fee, both clubs have announced.
Nordtveit, 25, joined the Hammers on a free transfer from Borussia Monchengladbach last summer and now returns to the Bundesliga after a year in the Premier League.
A statement on whufc.com read: "Havard Nordtveit has completed a transfer to German Bundesliga side Hoffenheim for an undisclosed fee."
Nordtveit, who has signed a five-year deal until June 2022, made 21 appearances for the Hammers and described his year in England as "less than ideal".
He told Hoffenheim's official website, achtzehn99.