Conor McGregor shocked the MMA Universe earlier today when he took to Twitter to announce his retirement from the sport.

The current UFC featherweight champion was supposed to rematch Nate Diaz in the headlining bout of UFC 200 this July in Las Vegas.

The UFC has yet to release a statement on McGregor’s retirement, but many fighters took to Twitter to share their respective opinions on the matter:

I have decided to retire young.
Thanks for the cheese.
Catch ya's later.

— Conor McGregor (@TheNotoriousMMA) April 19, 2016

https://twitter.com/NateDiaz209/status/722514064576917505

Well fuck it, I have decided to retire old. Thanks for the shoes @Reebok

— player/coach (@CMPunk) April 19, 2016

https://twitter.com/FunkMaster_UFC/status/722502667256348672

I sought it. Just another stunt to get people to talk about his bitch ass https://t.co/U9Tww5KPh4

— Cowboy Cerrone (@Cowboycerrone) April 19, 2016

https://twitter.com/Alistairovereem/status/722507941752889344

Mcgregor said his not running away from the adversity and announce retirement, can someone explain me that? #frouxo

— Rafael dos Anjos (@RdosAnjosMMA) April 19, 2016

I'm available for #UFC200 #suckerpunchking to the rescue

— Jorge Masvidal UFC (@GamebredFighter) April 19, 2016

Nice troll by Conor imo… How many times did Mayweather retire?

— Matt Brown (@IamTheImmortal) April 19, 2016

Well was fun while it lasted

— Coach Kavanagh (@John_Kavanagh) April 19, 2016

Conor stole his tattoo designs from a model and his bargaining tactics from @FloydMayweather

— Colby Covington (@ColbyCovMMA) April 19, 2016

What was your reaction to the Conor McGregor retirement news? Sound off PENN Nation!