When a three-match ban was initially slapped on Rooney for kicking Miodrag Dzudovic in last October's encounter with Montenegro, the Manchester United striker feared he would not get selected for the finals.
After all, he reasoned, should England fail to emerge from its group, he would have zero involvement.
It was Capello who insisted the
So, the 26-year-old is free to tackle co-host
"Being honest, if it had stayed at a three-game ban I wouldn't have expected to be here," he said.
"I was delighted Capello fought so hard.
"We both went over to
"He did (go out on a limb) and I am grateful for that.
"Basically, he said when we went out there if there's one per cent of getting the ban down we have to try for it."
Had Rooney missed out, it would have extended an unhappy sequence of experiences at major tournaments.
Sent off against
Montenegro represented another low point, yet came in a season when Rooney's overall behaviour has been better than ever.
Indeed, his first Premier League booking did not arrive until the penultimate game, leaving him as nonplussed as the rest of us by those significant dips in self-control.
"I've been asked a few times about what happened with that red card," he said.
"Even now, I honestly can't explain it.
"It's similar to the one in 2006. It's not something I set out to do. I didn't think: 'Right, I'm going to kick this player'.
"I understood straight away it was a mistake and I have had to pay the price.
"Obviously as a player you have bad moments. Sometimes you have to go through those bad moments to experience the good."
Rooney is not even willing to blame the obvious pressure that comes with being one of the world's most high-profile sports stars for his occasional lapses, simply because he refuses to acknowledge its existence.
"I don't feel it," he said.
"Sometimes it might look like I do but I never think: 'I have to try too hard' to make us win.
"Maybe I would like to walk out and have a coffee, but it's difficult when you have 10 to 15 people following you.
"So sometimes you do lock yourself away. But that's part of it, I suppose.
"There are no problems with my attitude or my temperament. I'm happy and I'm ready to play."
Nevertheless, as Sir
Rooney is certainly a less bullish character than before.
For instance, it is hard to imagine him striding through the entrance of the
"I don't think I could say that now that
"I'm sure you all know I'm a confident person.
"I'm not one to shy away from games. I always want to do well and feel I'm good enough to do that.
"That's been in me since I was a young boy and it won't change."
UEFA president Michel Platini said preparations for Euro 2016 were "progressing well" after a meeting of the organising committee in Lille.