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The "Michael Sam to Dallas" move was a bang-bang play -- with the whole deal unfolding in a just a couple of hours ... starting with a phone call from Dallas to Sam's camp around 11AM on Tuesday.
Our NFL sources tell TMZ Sports ... the whole thing was like a whirlwind -- and Sam had no idea he was in the cards for Dallas until the phone rang.
After that, Sam hopped on the first plane to Texas -- where he'll join the practice squad ... pending a physical.
Our sources tell us ... Sam is fired up about the opportunity and can't wait to get on the field.