Sunderland have signed striker Leon Dajaku on a season-long loan from German side Union Berlin as well as goalkeeper Thorben Hoffmann from Bayern Munich.
Dajaku, 20, spent the latter half of last season on loan with Union Berlin from Bayern Munich before the club triggered a deal to buy him.
Dajaku went on to join Bayern in 2019 where he made two appearances.
Hoffmann, 22, also joins on a season-long loan from the German champions.
Dajaku told the club's website: "It feels very good to sign for Sunderland and I'm very proud to be here.