Former Derry City boss Stephen Kenny was admitted to hospital in Sweden after becoming unwell in Vaxjo Airport.
Kenny, who is now coach of the Republic of Ireland Under-21 side, had been complaining of feeling unwell in the hours leading up to being hospitalised on Wednesday.
The FAI last night confirmed that their U-21 manager, due for promotion to the senior post next summer, will remain in hospital for a few days following his health scare.
Following Tuesday night's epic 3-1 victory over the Swedes in Kalmar Kenny, his staff and most of his players were travelling to Vaxjo Airport to catch a flight to Amsterdam on the first leg of their trip back home to Ireland.
It is understood the Dubliner felt sick overnight but his condition only became of concern to the travelling party as he entered the airport.
His players had already passed through the security channel when their manager was made to sit down under the supervision of the FAI's medical staff.
They then took a swift decision to seek further assistance at the local hospital.
An FAI statement read: "Republic of Ireland Under-21 boss Stephen Kenny has remained in Sweden after becoming unwell on Wednesday as his squad made their way home from Tuesday night's European Championship qualifier in Kalmar.
"Stephen expects to be discharged in the coming days and is looking forward to beginning preparations ahead of the two European Under-21 Championship qualifiers next month."