Play video content EXCLUSIVE TMZSports.com

Kellen Winslow Jr. says he's getting real interest from multiple NFL teams -- despite the fact he hasn't played since 2013 -- but says he's laser-focused on getting a shot with the Packers.

The 33-year-old former Pro Bowl tight end tells TMZ Sports he's been training his ass off -- and is 100% positive he still has the ability to dominate in the NFL.

In fact, Winslow worked out for Green Bay back in August -- and says playing with Aaron Rodgers would be his dream job.

There's been a lot of tight end movement in the league over the past few days -- question is ... will Winslow get the call?

"It's all about the GMs pulling the trigger on me."