Police want to speak with two men captured shirtless at Central Station by CCTV following the brutal bashing of an NRL fan at the weekend.

"John" says he was travelling home from Homebush after the Penrith-Canterbury preliminary final on Saturday night when he saw an argument erupt on the train. He intervened as the dispute become more heated.

"John" was bashed on the way home from a football game. Credit:Mitch Wall, 9NEWS

Police say one man punched John in the face multiple times while another man held his arms back. Both alleged attackers were wearing Penrith Panthers jerseys, the team that had lost the evening's game.

Other commuters separated John from the alleged attackers as the train approached Central but the two men were seen running towards Chalmers Street after it pulled up to the station.