Schalke manager Thomas Reis has admitted that he doesn't know when Liverpool loanee Sepp van den Berg will return from the sidelines.
The Dutch defender has been out of action since October when he suffered an ankle injury during the 3-2 defeat to Augsburg. As a result, he went under the knife to repair the damage to his left foot.
Van den Berg has remained in Gelsenkirchen with Schalke in his recovery and travelled to Turkey with the Royal Blues as part of their preparations for the Bundesliga restart.
