Coventry City's Martin Cranie picked up a rub injury during the defeat at Barnsley on Saturday.
The defender injured himself making a brave clearance early on in the game and lasted until the 48th minute, when he had to be replaced by David Bell, in a reshuffle which saw youngster Conor Thomas drop to right back.
Speaking about Cranie's injury to Andy Turner from the CT, Thorn said: "He checked out ok at half-time but got another whack on it and couldn't breathe properly."
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