The former German goalkeeper, who had previously represented Liverpool as well, departed from Newcastle United in the summer transfer window.
“This is certainly not an easy situation at the moment,” Karius said last week.
“Being without a club as a player is one of the worst things, but I take it relatively calmly because I’ve had a lot of ups and downs in my career. So, I can deal with the situation quite well, even if I would of course wish it were different.
“You have to be realistic. I had a few offers in the summer that didn’t appeal to me, which is why I made the decision to reject them and wait."