Update
WWE.com confirmed with a statment as well:
Daniel Bryan announced today on Twitter that, effective immediately, he would be retiring from in-ring competition. The former WWE World Heavyweight Champion revealed that he would elaborate on tonight’s episode of Raw. Stay tuned to WWE.com for more information on this breaking story, and voice your appreciation using #ThankYouDanielBryan.
Original article
After nearly a year on the sidelines, it appears that Daniel Bryan will not ever be returning to the WWE ring.
In a brief statement on Twitter today, Bryan announced that he would be retiring from WWE, effective immediately.
Here is the tweet:
Due to medical reasons, effective immediately, I am announcing my retirement. Tonight on Raw, I'll have a chance to elaborate. #gratitude
— Bryan Danielson (@bryandanielson) February 8, 2016