Schalke 04 have confirmed that Nabil Bentaleb and Hamza Mendyl will be out of Bundesliga action for an indefinite period.
The African duo did not feature in the Royal Blues' 5-0 Bundesliga defeat at Wolfsburg on Saturday as Mendy watched on as an unused substitute.
The Morocco international was said to have picked up an ankle injury during a training session which will make him unavailable for the unknown period.
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Bentaleb, on the other hand, went under the knife to treat his groin and he is expected to continue his rehabilitation in two weeks.