Eagle-eyed Whites fans may have spotted an Argentine shaking boss Marcelo Bielsa's hand at Pride Park yesterday.
The man, dressed in a Newell's Old Boys shirt, looked delighted to be meeting his countryman.
He has now been revealed as Diego Lopez - an Argentine who recently moved to Derby.
Posting on Twitter, Diego said:
"I am the happy guy in the picture shaking hands with Marcelo. I am Argentinian, recently moved to Derby and couldn't miss the change to go and meet this legend."
Leeds United supporter Scott White met Diego in a Frankie and Benny's restaurant near the Derby County ground before the game, and confirmed on Twitter that he had recently travelled from South America.
Bielsa played for the Argentine club side in his hometown of Rosario from 1977-78, returning to manage them from 1990-92. His first coaching job was with the club's youth teams.