Earl Thomas ain't playing around with the Seahawks anymore ... issuing an epic ultimatum, saying, "Offer me an extension. Or trade me to a team that wants me to be part of their future."
The All-Pro safety wrote a 1,500-word letter to his fans and Seattle's front office titled, "Here's What's Actually Going On" ... and in it, he explains all his reasons for holding out of 'Hawks camp.
"I’m standing strong on this -- because I’ve got to," Thomas says. "I’m standing strong when it comes to getting what I deserve.