Mr Adams had been working in a bar on match day
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Police investigating an attack 18 months ago which left a barman in a coma want to speak to a woman who contacted the BBC TV Crimewatch programme last year.
Leon Adams, 25, was found unconscious at Grangetown railway station in the early hours of Valentine's Day.
Mr Adams, from Ystradgynlais in the Swansea Valley, remains at Morriston Hospital following the attack.
BBC's Crimewatch has twice featured the incident and issued an appeal for public help, but the response has been disappointing.
However, detectives have now revealed they are keen to speak to a woman who contacted police anonymously after seeing one of the programmes last year.
On Wednesday police revealed a man had been arrested in connection with the incident and was being held for questioning.
The 24-year-old - from the Grangetown area of Cardiff - has not been charged.
Mr Adams had been working in The Cottage pub in St Mary Street, Cardiff, on the day Wales played Argentina in football at the Millennium Stadium.
He was spotted on CCTV walking down St Mary Street just before 0200 GMT, and was found unconscious just after 0500 GMT.
A poster campaign was also launched when Wales played Bosnia a year later, in February 2003.
Anyone with information should call Fairwater Police Station on 02920 571530 or Crimestoppers on 0800 555111.