Just after midnight on Thursday, the 18th of September, two men had a brief exchange on the platform of East Croydon railway station.
As the men walked away from one another, one doubled back and shoved the other man who fell backwards against a wall, causing three broken ribs.
Officers believe the man pictured may have information that could help their investigation.
Anyone who recognises him is asked to contact British Transport Police by texting 61016 or by calling 0800 40 50 40, quoting reference 18 of 18 September.
You can also contact Crimestoppers anonymously on 0800 555 111.
