Bolton's central defender was released from hospital on Monday after developing a blood clot in his left arm, but the medication used to treat his condition means he will almost certainly miss the rest of the season and be denied a chance of making Fabio Capello's England squad.
Cahill, 24, is taking warfarin, an anti-coagulant that thins the blood in humans and is also used as rat poison.
Big blow: Cahill will play no further part for Bolton this season
Although it dissolved the clot, Cahill would be in danger ofsuffering internal bleeding if he were involved in a heavy collisionwith another player, and that is a risk Bolton boss Owen Coyle is notprepared to take.
'There is no getting away from it, he'll be out for a number ofmonths,' said Coyle ahead of Tuesday's game at Manchester City. Givenwhat I'm being led to believe regarding the medication, I will not betaking a risk with Gary Cahill's welfare and wellbeing.
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