Team Sky's Gianni Moscon is facing disciplinary action from Team Sky after it emerged he used racially abusive language towards FDJ's Kevin Reza at the end of Friday's stage three.
Italian Moscon apologised and rode in Sunday's final stage.
"Any complaint will be investigated," the UCI told BBC Sport.
Team Sky chose not to withdraw Moscon from the race following discussions with FDJ. Moscon has apologised to Frenchman Reza and his team-mates but the British team will consider what action to take after establishing all of the facts of the incident.
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The three-week trial on the 23.4m long 'up' escalator at Holborn station is taking place during peak hours.
Transport for London said the move will "increase the capacity" and prevent "queuing at the bottom" as people stand on both sides of the escalator.
More than 56 million passengers use the station every year.
Usually passengers stand to the right, leaving the left side free for people to walk up or down the escalators.
Holborn Tube station, one of the busiest on the network, is set to get a new entrance and an enlarged ticket hall in order to increase its capacity by 80% by 2022.
Peter McNaught, operations director for the Central line, said: "In the meantime, as part of a three-week trial to reduce queues and keep people moving through the station, we are encouraging customers to stand on both sides of the 'up' escalators during busy periods.
"We believe this will increase the capacity of the escalators as more people will be able to board, preventing queuing at the bottom of the escalator."

The lawsuit filed in a federal court in San Francisco argues that the policy is unconstitutional.
Women can serve in front line positions in the US military, but they are barred from ground combat units.
A Pentagon spokesman said 14,500 combat positions had been opened to women under the current defence secretary.
He added that Defence Secretary Leon Panetta had "directed the services to explore the possibility of opening additional roles for women in the military".
But ACLU lawyer Ariela Migdal said the changes so far were "not enough". The lawsuit argues that continuing restrictions violate servicewomen's constitutional rights to equality.
One of the plaintiffs, Marine Corps Capt Zoe Bedell, said existing rules had blocked her advancement in the Marines.
"The military is the last place where you are allowed to be discriminated against because of your gender," she said.
Women account for about 14% of the 1.4 million active US military personnel.
The lawsuit launched on Tuesday says they are barred from 238,000 positions, but also alleges that they are already serving unofficially in combat units.
Cycling's governing body has warned that any rider found guilty of racism will be sanctioned after an incident during the Tour de Romandie.
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Commuters are being asked to stand rather than walk on the left side of escalators at a central London Tube station to see if it can cut queues.
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The American Civil Liberties Union has filed a challenge on behalf of four US servicewomen against a ban on women being deployed in most combat roles.