It was in the match against Villarreal on September 8 that the 18-year-old was taken to hospital after suffering circulation problems and was forced to lie down on the pitch.
After several days in hospital, undergoing tests and training on his own, he has now started training with the team again.
"I feel good. We tested everything and everything is good. I just need to adapt a little to the intensity, but that will come with time," Karetsas said in a video on X on Monday, when he visited his former club Genk.
