The UFC featherweight champion was speaking at the launch of John Kavanagh's autobiography, "Win or Learn"
Conor McGregor's career in the Ultimate Fighting Championship is well documented.
The rise of the 27-year-old has been something to behold, since his first knockout against Marcus Brimage, to his victory over Chad Mendes to claim the interim featherweight title and right through to last December when he defeated Jose Aldo in just 13 seconds to become the undisputed featherweight champion.
These achievements are not to be looked past, but speaking at the launch of coach John Kavanagh's autobiography, "Win or Learn", McGregor said one of the highlights of his career was the arrival of the UFC to Dublin in 2014.
"I mean how could I not soak [the atmosphere] up?" he said, "I mean the noise of the arena... I've fought in many different places after that, in Vegas and places almost double the size of the O2 and I've still not felt a noise like that since.
"It went past noise, it was like a buzzing sound. That for me was one of the most special moments because at that time I was just in. But after that, we were all in. "
Conor McGregor defeated late replacement Diego Brandao in the fist round of his fight and for the first time in Ireland, experienced the support of the Irish fans.
Conor McGregor facing Diego Brandao during the UFC Fight Night Dublin, 19 July 2014. Image: ©INPHO/Rodrigo Romos
"Everyday we open up the gym and it's cold, there's many struggles and there's blood, sweat and tears between us all in the gym together. But now everyone was in; Paddy's [Holohan] in, Cathal's [Pendred] in.
"It was a great moment for Straight Blast Gym. All our hard work was finally being recognised. Probably still to this day, even with the belts, UFC Dublin and the Mendes fight for me were my two biggest moments so far in my career.
"The [Jose] Aldo fight was great but it was just solidifying what we already knew. I went through it for the Mendes fight and I won it. Those were my best moments, so far. The game is young."