British Transport Police (BTP) say the images were captured at 8pm last Wednesday, the day after Chelsea’s Champions League match in Paris.
Officers believe the men had returned to London following the match against Paris Saint-Germain.
A member of the public reported being ???disgusted??? by the men???s chanting and reported their behaviour to police.
Detective Sergeant Steven Graysmark said: “I want anyone who knows the men in the photographs to come forward.
“I believe the seven, thought to be Chelsea fans, can help us with the investigation. Do you know any of the men in the images? If so, please contact BTP.”
A similar incident was reported on the Paris Metro shortly before the Chelsea match on 17 February.
On Friday the club suspended three supporters??after video emerged of a commuter being pushed on the Paris Metro.
The commuter, Sylla Souleymane, appeared to be stopped from getting on an underground train by fans.
The fans were also heard in the video chanting “we’re racist and that’s the way we like it”.
The club said the fans had been suspended from its Stamford Bridge ground and that they would be banned for life if there was “sufficient evidence of their involvement”.
Mr Souleymane said last week that he thinks those who abused him in Paris should be jailed for their actions.
The 33-year-old told Le Parisien newspaper: “These people, these English fans, must be found, punished and must be locked up. What happened should not go unpunished.”
He said he thought Chelsea and PSG should face sanctions because it was “also their fault”.
Anyone with information can contact British Transport Police on 0800 405040. Information can also be reported anonymously to Crimestoppers on 0800 555111.