According to reports from both English and Greek media, it seems Norwich are trying to cut his loan short and get him back to England. Norwich's new manager David Wagner has apparently asked for Tzolis to return to the club as he wants to use him for the 2nd half of the season.
Hopefully his return means he gets some consistent minutes under his belt and he is able to develop into the player we all want him to be.
https://www.pinkun.com/news/23284574.norwich-city-transfer-news-christos-tzolis-set-return/
https://www.sport24.gr/football/diapragmateyseis-tis-norits-me-tin-tvente-gia-tin-epistrofi-toy-tzoli.9921921.html