Republic of Ireland manager Giovanni Trapattoni is in danger of missing tomorrow night's friendly with Argentina after suffering with food poisoning.
Trapattoni is currently under observation and undergoing tests at Dublin's Mater Hospital after being taken there at 3am following further bouts of vomiting.
The Football Association of Ireland confirmed Trapattoni, who is now in a stable condition, had been feeling unwell upon his arrival in Ireland on Sunday night.
It is understood the illness has been caused by shellfish the 71- year-old ate prior to leaving Italy.
FAI team doctor Alan Byrne said: "Giovanni had been feeling unwell, suffering with nausea and vomiting.
"But late last night he started vomiting more. He called me at 1.45am and it was clear things had changed.
"I wanted more comfort in terms of where we were, so we decided to take him to the Mater where we have launched an investigation.
"He has had blood and urine tests, scans, x-rays and an ECG. Some tests are already known and they are already very good.
"But some are still pending and we may not know the results of those until tomorrow. We need to see how things go over the next 12 to 24 hours.
"It's not a serious problem, but with shellfish-type food poisoning it can have a greater impact, so everything is just a precaution.
"At the moment he is stable. He has spoken with his wife on a couple of occasions and we are making arrangements for her to come over if she requires."
Trapattoni has at least named his team for a game that marks the first international football match to be played at the new £350m Aviva Stadium.
Shay Given will start in goal, with a back four of Paul McShane, Richard Dunne, John O'Shea and Kevin Kilbane.
Across the middle will be Liam Lawrence, Keith Andrews, Paul Green and Damien Duff, whilst Robbie Keane and Kevin Doyle are in attack.
Dunne and Doyle are doubts, however, with knee and calf injuries respectively, so Darren O'Dea and Cillian Sheridan are on standby.
For today assistant Marco Tardelli will take training, although he is hopeful Trapattoni will be capable of taking charge.
Tardelli said: "I think everything is okay and he will be in the dugout. He is very strong."
Ahead of his 100th cap for the Republic, captain Keane added: "We are all hoping he will be fit.
"It won't be the same without him."