Bayer Leverkusen claimed a shock 2-0 Bundesliga win at Borussia Dortmund on Saturday, while Hannover beat Schalke.
Hannover came from behind to beat Schalke 2-1 and increase the pressure on the Royal Blues' coach Jens Keller.
Sky Sports understands that Dinamo Zagreb striker Duje Cop is attracting interest from clubs across Europe.
Benedikt Howedes has been linked with a move to Arsenal, among others, but he is expecting to remain at Schalke.
Schalke have signed goalkeeper Christian Wetklo on a one-year contract to provide cover for number one Ralf Fahrmann.
Tottenham strikers Emmanuel Adebayor and Roberto Soldado scored as Spurs wrapped up pre-season with a win over Schalke.
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