Werder Bremen are concerned that a change in management at Chelsea could scupper their chances of signing Claudio Pizarro.
The Peruvian striker is currently on loan at the Bundesliga side from Stamford Bridge.
He endured a difficult 2007/08 season in England, his first with the Blues, and was deemed surplus to requirements by Luiz Felipe Scolari.
However, the Brazilian coach has since moved on, with Guus Hiddink filling the managerial breach in west London until the end of the season.
With the club now heading in a different direction it remains unclear which players have a future at Stamford Bridge and which do not.
Should Pizarro find himself back in favour next term, then Bremen's hopes of taking him back to Germany on a permanent basis will be dashed.
"The decision will take time and they will be waiting to see what happens. Who will they buy, who will be moved on," Bremen's general manager Klaus Allofs told BILD.
"We have to be prepared to wait on a decision for quite some time. Potentially up until late August.
"But we have an agreement with Claudio. He wants to stay with us as he feels happy at our club.
"That is certainly increasing our chances at this end."
Meanwhile, it has emerged that Bremen attempted to sign Dinamo Zagreb striker Mario Mandzukic towards the end of the winter transfer window.
Zagreb's director of sport Zoran Mamic claims to have been approached by the German club, but made it clear that the Croatia international is not for sale.
"Klaus Allofs wanted to fly down to Belek, where we have been training, and make a bid," Mamic told BILD.
"But I told him that Mandzukic is not for sale.
He added: "I cannot keep a player that really wants to move on. That would be very tough.
"Bremen are a big club and I cannot say that nothing will happen in the future. But we are not prepared to let Mario leave for £8million (the figure Bremen are reportedly willing to pay). We will not sell him for that amount."