Bernard Brogan called time on a 15-year inter-county football career on Thursday.
The Dublin footballer won seven All-Ireland titles, four All-Stars and was Footballer of the Year in 2010.
"The hardest bit of all this has been leaving the WhatsApp group," the 35-year-old told RTÉ News.
It was something I didn't think about until the very end when I was saying that I have to tell the guys this before I announce this. Then I was like, 'That means I have to leave'.
I actually did a little video for the lads and put it up on the group and then left. It was a tough one, it was emotional.
I was in London today and I had nearly tears this morning on the plane when I was thinking about it.
Brogan named the 2011 All-Ireland win against Kerry - one which ended a lengthy drought for Dublin - as the highlight of his career.
"My first one," said Brogan, "to have my two brothers, Paul and Alan and James, my cousin and business partner there on the field, it was an amazing one to get over the line after 16 years."
In a statement released on Thursday evening, Dublin manager Jim Gavin said:
"A great leader of the team, Bernard inspired those around him by his actions, resolve and determination to be the best player that he could be for Dublin. The longevity of his inter country career, his collection of medals and awards is a testament to the impact he has on Gaelic games – for that we are truly grateful."
The hardest part of calling it a day? Leaving the WhatsApp group... Bernard Brogan reflects on a glorious run in Sky Blue with @MartyM_RTE #RTEgaa pic.twitter.com/BejzfjPUJ1
— RTÉ GAA (@RTEgaa) October 24, 2019
Photo by Stephen McCarthy/Sportsfile