Ousmane Dembele is reportedly a target for Bundesliga champions Bayern Munich and Franck Ribery has urged his old club to spend.
Aaron Ramsey and Diego Godin have already signed for new clubs, while Ander Herrera and Mario Balotelli are among the big-name free agents.
Western Sydney Wanderers had been linked with a move for Franck Ribery, but the departing Bayern Munich star is too expensive for them.
Karl-Heinz Rummenigge addressed reports linking Bayern Munich with Manchester City's Leroy Sane.
Bayern Munich claimed a 3-0 win in the DFB-Pokal final, with Franck Ribery coming on as a substitute to make his final appearance.
Franck Ribery and Arjen Robben have had to settle for a place on the Bayern Munich bench in the DFB-Pokal final against RB Leipzig.
Manuel Neuer has been out for almost six weeks but will return from a calf problem for Bayern Munich in the DFB-Pokal final.
Franck Ribery and Arjen Robben, who will both leave at the end of the season, savoured their final home appearance.
Niko Kovac hailed Franck Ribery and Arjen Robben, who bowed out of the Bundesliga as champions on Saturday.
Bayern Munich pipped Borussia Dortmund to the Bundesliga title as they swept aside Eintracht Frankfurt at the Allianz Arena on Saturday.