Karl-Heinz Rummenigge has warned Bayern Munich's defenders they are playing for their future at the club.
Bayern's bid to defend their Bundesliga title has been blighted by defensive errors as they lie eighth after winning just five of their opening 13 league games.
Bayern's director of sport, Christian Nerlinger, has refused to be drawn on whether last season's UEFA Champions League runners-up are considering making moves in the January transfer window.
But the club's chief executive Rummenigge has admitted Bayern will be forced to weigh up potential transfer targets if they fail to fix their defensive frailties.
"If we do not get used to controlling our errors in the back four we will have to do business on this," he told Sky Deutschland television.
"We will carefully look into this. We are going to analyse things and then come up with a binding decision."
Nerlinger had earlier said: "I do not see any use in being thrown into speculation."
Left-back has been a particular area of concern for Bayern and they are already being linked with Domenico Criscito of Genoa, while Everton's Leighton Baines and Chelsea right-back Jose Bosingwa are also thought to be interesting the German giants.