The best marking and footballing corner back ever. Probably outscored the man he was marking over the course of his career. @osemarc2

— Stephen O Brien (@Stephenob15) October 12, 2016

All the best to @osemarc2 on the retirement. One of the most naturally gifted footballers ever. A great guy and friend. #kerrylegend pic.twitter.com/jDHMquBHJo

— Bryan Sheehan (@BryanSheehan9) October 12, 2016

Incredible player, unbelievable roommate & great friend, well done Marco on a great career. #YouHadAGreatRun @osemarc2 gonna miss our chats😢 pic.twitter.com/iTAtEeKFd8

— Darran O'Sullivan (@Darransull86) October 12, 2016

What a career by @osemarc2. A player who had everything 💛💚

— Brian Kelly (@bkelly_1) October 12, 2016

If you could have one player. Thanks @osemarc2 . pic.twitter.com/mxrz6Fmo8y

— Paul Geaney (@Geaney15) October 12, 2016

A fantastic servant to @Kerry_Official @osemarc2 it was a pleasure to play alongside you since we were young lads. Best wishes.

— Sean O Sullivan (@SeanTheBawn) October 12, 2016

Great battles over the years! One of the greatest of all time, my arch nemesis and good friend! Enjoy the retirement @osemarc2 pic.twitter.com/cXeF6ZQuzT

— Bernard Brogan (@bernardbrogan) October 12, 2016

He'd a better dummy solo than the men he was marking. Congrats on an amazing career adding to your illustrious family history @osemarc2 pic.twitter.com/nNtOq4CKoA

— Aaron Kernan (@AaronKernan) October 12, 2016

What a contribution not just Kerry football but to the GAA the length and breath of the Island. Congrats @osemarc2 #whatacareer

— John Doyle (@johnnydoyle78) October 12, 2016

When was the last time there was no representation of the O'Se family involved with @Kerry_Official? What a career @osemarc2. Well done. 👍

— Killeavy13 (@StevenMcD13) October 12, 2016

All the best in retirement @osemarc2 Great career to be immensely proud of, not to mention a nice collection of medals 😎👍🏻

— Cathal McCarron (@mc_carron1) October 12, 2016

Congrats to my college team-mate @osemarc2 on an incredible #GAA career. As honest and classy a footballer as you'd see. #DummySolo

— Barry Cahill (@barrycahilldub) October 12, 2016

I had the pleasure of spending a few days in New York with @osemarc2 a true gent & one of the greatest corner backs to have played the game

— Jackie Tyrrell (@MrJackieTee) October 12, 2016

What a career @osemarc2 class act 👏🏼👏🏼

— Seamie Callanan (@seamiecallanan) October 12, 2016

Congrats on a great career @osemarc2 .. The O Shea name will be greatly missed in the @Kerry_Official jersey. Enjoy the down time

— Michael Fennelly (@MFennellyKK) October 12, 2016