Zulte Waregem management are still to hear from Charly Musonda since offering him a contract.
Marca says there is concern over the whereabouts of the former Chelsea midfielder.
Musonda was allowed to come off contract at Chelsea this summer and had been trialling with Zulte Waregem.
He had done enough to earn a contract offer and was expected to put pen to paper a fortnight ago.
However, Musonda has disappeared and has yet to make contact with Zulte since terms were discussed.
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