Karius, on-loan with Besiktas, has left Turkey to return home to Germany while the league is suspended due to the coronavirus.
Fanatik says his agent informed Besiktas this week that Karius would be spending the shut down in Germany.
Interestingly, Karius is being linked with Hertha Berlin for the summer market.
Besiktas won't be taking up the option to buy the keeper outright.
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