Former Arsenal captain and assistant manager Pat Rice is being treated for cancer.
The 64-year old has been admitted to hospital.
He was capped 49 times for Northern Ireland during his playing days.
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Arsenal manager Arsene Wenger says they hope his "legendary strengths" help him recover.
He said: "Not only do we love him but of course we are very grateful for what he has done here."
Rice was Wenger's assistant from 1996 to 2012.