Liverpool are reportedly willing to listen to offers for goalkeeper Loris Karius during the remainder of the European transfer window.
Karius's future at Anfield has been under intense scrutiny since his high-profile errors in last season's Champions League final, and the summer arrival of Alisson Becker saw him slip down the pecking order.
The Mirror reports that Besiktas are interested in signing the 25-year-old on loan, with a view to making the move permanent at the end of the season.
Klopp will not sell both Karius and Mignolet this summer, but is now considering letting Karius leave instead of the Belgian should a suitable offer arrive.
Karius made 33 appearances for Liverpool across all competitions last season, having usurped Mignolet as the team's number one.