The incident occurred at around 2.20am, during the Night Tube services, on Saturday March 25.
A man and a 45-year-old woman were struck walking through the station corridors, police said.
Police attended the altercation and arrested a 58-year-old man from Beaconsfield on suspicion of common assault.
He was later released on police bail to return on Thursday April 20.
As a result of the assault, the victims received minor injuries.
The alleged male victim has yet to make contact with police and officers are now keen to trace him.
Police are also urging witnesses and anyone else who was at the station at the time to come forward.
Anyone with information should call BTP on 0800 40 50 40, or send a text to 61016, quoting reference 49 of 25/03/2017.
Alternatively, information can be passed on anonymously via Crimestoppers on 0800 555 111.
Keep up to date with the latest news in west London via the free getwestlondon app
You can even set it to receive push notifications for all the breaking news in your area