Mike Vick -- I Love Pittsburgh ... But I'll Play For Anyone!

Mike Vick says he's training his ass off to return to the NFL ... with his rep telling TMZ Sports the QB would love to stay in Pittsburgh, but he's open to playing for any team in the league.

Earlier this month, Vick told reporters he's got "one more dedicated season in my blood" -- but also said he'd be okay if he didn't get picked up by a team in 2016.

Well, we're told Vick is still preparing as if he will play in '16 -- "He's training every single day. [He's] staying ready mentally and physically."

When asked if he had any preference, Vick's rep told us he loved playing in Pittsburgh "but he'll be ready wherever he goes."

Vick is currently a free agent -- but his rep reminded us that he didn't get picked up last year until the end of August ... so he's not sweating it yet.