Two clubs, Bayer Leverkusen and FC Cologne, also announced partnerships in China, one of the fastest growing markets in world football.
Hernandez, 28, has failed to find the back of the net in a total of 708 minutes in all competitions.
Chelsea are ready to rekindle their interest in Hoffenheim defender Niklas Sule in the January transfer window.
Robert Lewandowski limped out of Bayern Munich training on Monday but his advisor has calmed fears that his client has suffered a serious injury.
Thomas Tuchel visited Borussia Dortmund's annual fanclub Christmas party on Monday amid claims of a row at the club.
Bjorn Johnsen and Perry Kitchen's performance in the Scottish Premiership headlines the latest edition of Yanks Abroad.