Bayer Leverkusen have completed the signing of Kevin Volland from Bundesliga rivals Hoffenheim for an undisclosed fee.
Stuttgart were relegated from the Bundesliga for the first time in 41 years after being beaten 3-1 by Wolfsburg on Saturday.
Bayern Munich were held 1-1 at home by Borussia Moenchengladbach on Saturday as Borussia Dortmund kept the Bundesliga title race alive.
Javier Hernandez believes Louis van Gaal is still capable of turning Manchester United's fortunes around.
Bayern Munich are 10 points clear after Robert Lewandowski scored twice in his side's 3-0 win over Schalke on Saturday.
Bayern Munich moved closer to a record fourth straight Bundesliga title as nearest challengers Borussia Dortmund were held 2-2 at Schalke.