Johnny Manziel -- BACK TO THE CLUBS ... After BCS Championship

The Johnny Manziel party train continued to roll last night ... but this time, the Heisman winner didn't leave the club with two hot models, he was with his quarterback coach ... and TMZ Sports has the footage.

Manziel -- who appeared as a guest commentator during the BCS title game Monday night -- was leaving Bootsy Bellows on the Sunset Strip with QB guru George Whitfield Jr., a guy who's trained bigtime signal callers like Cam Newton and Andrew Luck.

In fact, Johnny even talked a little football on his way out of the club ... saying the dramatic Florida St. victory over Auburn was one of the greatest games he's ever seen.