Michael Sam — COMPLETELY SURPRISED … By Cowboys Offer

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The “Michael Sam to Dallas” go was a bang-bang play — with the whole deal unfolding in a just a couple of hours … starting with a buzz 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 thought he was in the cards for Dallas in anticipation of the buzz rang. 

After that, Sam hopped on the first plane to Texas — where he’ll join the do squad … pending a corporal.

Our sources tell us … Sam is fired up about the opportunity and can’t wait to get on the field.