Richie Incognito -- I'm Not Giving Up on the NFL ... 'Hoping to Get Back In'

Richie Incognito has arrived to the Super Bowl -- but he's not there to mess around ... the former Miami Dolphins lineman tells TMZ Sports he's laser focused on getting back in the league.

Incognito was hangin' at the W Hotel in Scottsdale Wednesday night ... where a bunch of huge NFL stars and league bigwigs were hanging out at a celebrity fashion show.

Incognito -- who hasn't played a down in the league since he was suspended for bullying Jonathan Martin -- told us he's still training hard and hoping a NFL team will take a chance on him after missing the 2014 season.

It could be tough sledding for the 31-year-old ... who was admitted to psychiatric care in the wake of the bullying scandal.

But when we spoke with him Wednesday, he seemed to be in great spirits -- even joking around about his eating habits.