Andrew Luck, the Indianapolis Colts' franchise quarterback, stunned the sports world Saturday with news of his imminent retirement from the NFL.

Former NFL players such as Jerry Rice, Victor Cruz and Kurt Warner expressed their surprise. Current players Derek Carr, Leonard Fournette and others are sending best wishes.

Here are some of the notable reactions after news broke of Luck's retirement:

Retirement of Andrew Luck is most shocking retirement since Jim Brown.

— Cris Carter () August 25, 2019

IS TODAY APRIL 1? I'm going on a 2 hours sleep & feel like I am hallucinating or dreaming bc every1 telling me #AndrewLuck is retiring from NFL!!??? TorF? It would be devastating 4 NFL & - but I understand stress & pressure that comes w/ his situation & support my brother!

— Kurt Warner () August 25, 2019

Andrew luck I understand you 100% brotha... take your time... I wish you the best

— Dez Bryant () August 25, 2019

Literally just saw Luck is retiring!!! #AFCSouth is OPEN!!!!

— Bernard Pollard Jr () August 25, 2019

Wow. Andrew Luck.

— Jamal Anderson () August 25, 2019

Reporters & fans can't believe Andrew Luck mentally checking out & retiring 🙄. I commend him for having the guts to come forward and be truthful. Personal health is more important than any game or team! The league def don't care about ur well being when it's over 🤷🏾‍♂️

— keith bulluck () August 25, 2019

I'm not sure who is to blame for Andrew Luck's retirement at age 29, but a piss poor training staff and crappy management will always and forever expedite the longevity of a players career. Andrew Luck, one of the brightest #NFL stars retiring at 29. Sad.

— Emmanuel Acho () August 25, 2019

Drew Brees on Andrew Luck retiring from the NFL #Saints pic.twitter.com/nqYxiBr48v

— New Orleans Saints () August 25, 2019

Andrew Luck will be somebody I tell my kids about. The person & the player. Respect Andrew ✊🏾 #LTE

— Eric Ebron () August 25, 2019

Wishing Andrew nothing but the best in this transition...whatever you decide to do, let your boy Fitz know, because I know it will be big.

If you're looking to use architecture degree, let's collaborate on something

— Larry Fitzgerald () August 25, 2019

Wow https://t.co/tXyeGKq5Ya

— jerryrice () August 25, 2019

Taking this time sending my prayers to Andrew luck man y'all don't know how much we put in for this sport, yes it's draining but than we love it so much at the same time...... #LoveLuck

— 7⃣ Leonard Fournette () August 25, 2019

Stunned by this Andrew Luck news!!! Waiting for the rest of this story to unfold...

— Victor Cruz () August 25, 2019

Andrew... are you sure? 👀

— Steven Jackson () August 25, 2019

Andrew Luck retiring reminds all Packer fans just how lucky we all have been since 1992.

— John Kuhn () August 25, 2019

The greatest 30 for 30 is unfolding before our eyes #Colts

— Damien Woody () August 25, 2019

True warrior who played through a lot. Will be missed in the league. #competitor https://t.co/30etwiTldH

— Lane Johnson () August 25, 2019

What a joke!!! SMH 🤦🏿‍♂️...boo-ing Luck...nahhhh they can't be serious -Dmac https://t.co/hFfxNdgnuh

— Devin&Jason McCourty () August 25, 2019

Much love to my fellow Texas brother.
Stiil remember our time together as Heisman finalists and how we laughed about almost being teammates at Stanford. The decision was only yours to make and I'm glad you have found peace in it. Respect https://t.co/4MQzsyZ9hz

— Robert Griffin III () August 25, 2019

Least he ain do it during season I guess... 😳👀🤦🏽‍♂️🤷🏽‍♂️ beat em in college, beat him in the league... one helluva competitor tho, shows you fans don't really be loyal in other states... my whodatnation different 🙌🏾🤞🏾

— cameron jordan () August 25, 2019

Damn luck just gon quit

— Chris Johnson () August 25, 2019

Wow... always enjoyed playing against him since high school! Wish him the best. https://t.co/J3MqtXQZtN

— Derek Carr () August 25, 2019

Uuuuuhhhhhh what 👀👀👀👀👀👀??????

— carl lawson () August 25, 2019

I always said I wouldn't be surprised if Luck retired in his prime. Yet here I am SHOCKED! He was truly one of the guys who seemed like he only played the game because he genuinely just enjoyed the game. Been thru A LOT physically and mentally. Happy for him.

— Darius Butler () August 25, 2019

Luck, I applauded you. Will always remember our games against each other. And the convos we had on the side about life and happiness. Do you bro!!! Will always support guys who do what's best for them over the latter.

— Eric Weddle () August 25, 2019

Thank you Drew for everything you gave this game! You are an amazing teammate and an even better friend. Wish you nothing but the best in your next endeavor. I know you will be even greater in your next chapter

— Richard Sherman () August 25, 2019

Amazing football career & person! Good luck on your next chapter in life even though you don't need it!! #GodBless https://t.co/cJsGEsqoJQ

— Jalen Ramsey () August 25, 2019