The 71-year-old is recovering from suspected food poisoning in hospital following nausea complaints and will undergo minor abdominal surgery later today.
Marco Tardelli, Ireland’s assistant manager, will take control of the side for their clash against the World Cup quarter-finalists.
A statement by the Football Association of Ireland read: “Following the results of further investigation, and consultation with his surgeon, it has been decided the abdominal pain is as a result of minor scar tissue from previous surgery.
“To relieve the pain, he will undergo minor surgery at 3pm today.”
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