Giovanni Trapattoni has revealed the reason for Kevin Foley's shock omission from the Republic of Ireland's Euro 2012 squad.
Wolves right-back Foley was left devastated on Tuesday when told he had been left out of Ireland's final 23-man squad despite having been included in the original party.
Paul McShane was only drafted into the squad as defensive cover with Richard Dunne, John O'Shea and Sean St Ledger all struggling with injury.
Dunne and St Ledger have since returned to action but fellow centre-back Darren O'Dea has joined O'Shea on the sidelines in recent days.
These concerns sparked a change of heart from Trapattoni, opting to include McShane ahead of Foley due to his ability to play in the centre of defence as well as at full-back.
The 73-year-old manager said: "We based our decision on the fact of the centre-halves - Dunne, O'Shea and O'Dea - all have problems. We are not sure if they will be 100%.
"McShane did a careful medical check and we decided to include him in the 23.
"The reason behind this is we need one more central defender and we know they are more subject to bookings."
Despite Trapattoni's vast experience, he admits the decision was a difficult one and had left Foley inconsolable.
He added: "I spoke to Kevin this morning and with regret, I communicated my decision to him. Obviously, he was clearly upset. Also me.
"But I have a responsibility to our team and the Irish nation. It's my duty to take this decision disregarding personal feeling.
"For me and for (assistant) Marco (Tardelli), it was very difficult, but we had to decide on one defender more.
"I said to him (Foley), 'We are happy if you decide to stay with us'.
"He said, 'Okay, I will think about it.'
"Obviously he is a little bit sad. That's normal."
The Republic of Ireland begin their Euro 2012 campaign against Croatia on June 10th.