The West Brom star suffered a serious knee injury at the weekend ruling him out of playing at the tournament.
One man who deserved to play in the competition more than any other was Chris Brunt. The West Brom star has played for his country for 12 years and has 54 caps for his country.
Unfortunately for the 31-year-old however he will miss out. He has suffered a serious knee injury and underwent reconstructive surgery this week. He will miss the rest of this season and the start of next, with the Euros also out of contention.
The sympathy for the West Brom star has been massive and now the Northern Ireland boss has had his say on the situation.
"To play as long as Chris has at international level and now to miss out on the finals is heart-breaking.
"I'm devastated for him and I'm devastated for the team as well."
It is a huge blow to Northern Ireland to lose one of their talisman at this stage, with just a few months to go until the tournament.
The West Brom star will however be asked if he wants to be involved in some way this summer, as confirmed by O'Neill:
"I spoke to him earlier in the week and I have assured him whatever part he wants to play in the tournament, he can.
"That will be important for him but equally, I know it's a difficult scenario for a player to be on the outside if they can't take part."
Perhaps Brunt will never play in a major competition for his country, but at least he will have the opportunity to experience it should the West Brom star decide to head to France.