Thiago Alcantara, David Alaba and Jerome Boateng are yet to sign new contracts that will keep them at Bayern Munich beyond next year, but Hansi Flick wants them all to remain.
Speculation has swirled around numerous key Bayern players in recent times, with several having contracts that expire at the end of the 2020-21 season.
Reports have suggested Thiago has been in talks with the club regarding a new deal, but that Bayern are growing frustrated by the Spaniard's prolonged silence.
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That has led to suggestions Thiago might be looking for a way out, and if his desire is to leave, Bayern will have to offload him in the coming months or risk losing him on a free transfer next year.