Norwich Sporting Director Stuart Webber confirmed at the annual Fans’ Forum on Thursday that the club would be announcing their new signing on Friday, which has held true.
Franke becomes Norwich’s seventh signing of the summer, joining Angus Gunn, Marley Watkins, Harrison Reed, Mario Vrancic, James Husband and Christoph Zimmermann.
Franke has signed a three-year deal with the club, joining for an undisclosed fee.
The German played 31 league games for Greuther last season as they finished eighth in their league. He stands at 6ft’ 4in.
The 24-year-old central defender could plug a gap at the back for Norwich, with the club only having two fully fit senior centre-backs at present.
Zimmermann has played every minute of pre-season so far but that could change if Franke is able to feature against Cambridge on Saturday.