Bayern Munich winger Arjen Robben has criticised stars at the peak of their careers who accept "crazy" money to go to China.
Carlo Ancelotti says he has "no concerns at all" over Thomas Muller's form and dismissed criticism he has used him out of position.
Spurs want to keep Kevin Wimmer despite offers from Cologne and several other clubs in the Premier League and the Bundesliga, his agent has said.
Hummels, 28, progressed through Bayern's youth teams but made just a solitary league appearance before opting to join Dortmund in 2009.
Hoeness, 65, was re-elected as Bayern president in November after serving a prison sentence for tax evasion.
Hamburg have signed Greek defender Kyriakos Papadopoulos on a six-month loan from Bayer Leverkusen.