The British Transport Police has released images of four men they would like to speak to after an assault on November 21.
At around 6.20am, a man was pushed down the stairs by a group as he was walking towards the Bakerloo Line.
The man hit his head and suffered an injury that later required hospital treatment.
He also had his wallet stolen by a group.
Detectives would like to speak to the men pictured, as they believe they may have information which could help their investigation.
Anyone who recognises them is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 65 of 21 November.
You can also contact Crimestoppers anonymously on 0800 555 111.
