Shawne Merriman -- I'm NOT Signed to WWE ... Yet

Shawne posted a pic earlier this week of some gnarly mat burn he got while training at the WWE's Performance Center in Florida ... leading many to believe he signed with the wrestling company.

But multiple sources tell us .. no deals were made, no paperwork has been signed ... Shawne was just messing around after WWE exec Triple H invited him down to check out the state of the art facilities.

We're told Shawne had a blast ... and the WWE people enjoyed having Shawne ... so, there's a possibility of the two juggarnauts working together in the future.

But for now, it's too early to tell if Shawne has a professional future in the squared circle.