Scotland Yard released images of the men they believed they were among a group of supporters who allegedly pushed a black man off the train and chanted a racist song in the French capital on Tuesday.
The incident happened ahead of Chelsea's Champions League clash with Paris Saint-Germain, which ended 1-1.
A Metropolitan Police spokesman said the three men had now been identified and the force was liaising with the French authorities.
None of the men sought by Scotland Yard have been arrested.
A police spokesman said the force cannot arrest people for offences which happen outside the UK but "a number of people" have now been spoken to in relation to the incident.
Footage posted online showed the commuter - named in reports as Souleymane S - being pushed back on to the platform amid chants of ''we're racist, we're racist and that's the way we like it''.
Five people have so far been suspended from Chelsea's Stamford Bridge ground following investigations into the incident.
The club has reiterated its promise to ban for life anyone proved to have been involved in the altercation and is helping police in the UK and Paris.
Chelsea manager Jose Mourinho said the club were "appalled" by the racial abuse, adding that owner Roman Abramovich was also "disgusted".