Sunderland midfielder to see specialist over ankle injury
The midfielder was taken off on a stretcher in the Under-23 draw with Tottenham Hotspur earlier this week.
Moyes, already without Lee Cattermole and Paddy McNair, says the injury will be assessed further today.
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Hide AdMoyes, speaking ahead of the visit of Leicester City tomorrow, said: "Looks like Lynden has damaged a ligament in his ankle.
"He is seeing a specialist today and then will have a clearer outcome."
Moyes added that Fabio Borini has started to train, while Jan Kirchhoff has overcome a sickness bug earlier in the week.
Moyes added: "Fabio has started to train.
"Jan Kirchhoff has had some sickness this week but he'll be around the squad this weekend."