Luck, 29, has battled a plethora of injuries throughout his career, including a high-ankle injury that had been plaguing him throughout the current preseason.
The announcement not only blindsided fans and media, but also players around the league.
From former players, teammates, to competitors, many turned to social media to react to the shocking news of the 2012 No. 1 overall pick’s retirement. Here are some of those reactions: