It's been a rough day for the Raiders. Not only were they forced to put two key players on injured reserved, but the team is also losing Blake Martinez, who abruptly decided to retire on Thursday. 

The 28-year-old linebacker revealed his shocking decision on Instagram. 

"I'm announcing my retirement from the game of football," Martinez wrote. "I had an amazing journey with some incredible franchises, and made lifelong friendships. I have chosen to step away from this career at this time to focus on my family and future passions! I am excited for this new journey and appreciate all the fans and organizations that have supported me throughout the years!"

To put it bluntly, this is a total shock. Martinez was one of the team's top defensive players during the Raiders' 27-20 loss to the Jaguars in Week 9. The linebacker, who played more than 90% of the Raiders' defensive snaps in the game, led the team with 11 tackles.