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It is suggested he is likely to sign a one-year contract, with the option for another year.
However, the two clubs are yet to reach an agreement.
Mayoral is in the last year of his contract but could still sign a new deal and move on loan.
Mendy set to become first choice
The Blues have brought in Edouard Mendy following months of sub-par performances, and the new man may become first-choice goalkeeper straight away.
As such, Frank Lampard is reportedly set to allow Kepa to leave on loan before the transfer window closes if a club can be found.
Van Aanholt is in the final year of his career and there are reportedly doubts over his future at the club.
Fiorentina could allow him to leave
It is claimed his current side will demand €60 million (£55m/$70m) for him.
Juve chief Fabio Paratici is said to have met with agent Fali Ramadani to discuss a move.