Fernando Torres is returning to Atletico Madrid on loan until the end of the 2015-16 season.
Steve Clarke is hoping to keep Glenn Murray at Reading after his loan deal expired following the 2-1 win over Norwich.
The Germany midfielder, whose current deal expires next summer, has been heavily linked with a move to Manchester United, with reports claiming a deal between the two clubs is imminent.
New president Hopfner warned Bayern's current offer would not remain on the table indefinitely.
"There will certainly be further talks. But at some point the player has to say what he wants," Hopfner said in an interview with Kicker magazine.
"We will not exceed certain financial boundaries."
Hopfner pointed to the case of Michael Ballack, who left the club for Chelsea in 2006, as a similar example.
"It was the same with Michael Ballack and at some point we withdrew the offer."