Roma have signed German defender Antonio Rudiger from Stuttgart after making his loan move permanent.
Werder Bremen moved out of the Bundesliga's bottom three after a thumping 6-2 win over Stuttgart on Monday.
Bayern Munich were held 1-1 at home by Borussia Moenchengladbach on Saturday as Borussia Dortmund kept the Bundesliga title race alive.
Bayern Munich remain on course for a record-breaking fourth successive Bundesliga title with a 3-1 victory at Stuttgart.
Bayern Munich maintained their lead at the top of the Bundesliga with a hard-fought 1-0 win at home to Eintracht Frankfurt.
Former Germany goalkeeper Timo Hildebrand has confirmed he is to retire from football, at the age of 36.