The Welsh Rugby Union has confirmed it is among 12 bidders to host the 2018 Rugby World Cup Sevens.
Wales' governing body has been joined by England, Scotland, South Africa, Scotland, Portugal, Singapore, New Zealand, Spain, Netherlands, Fiji and Hong Kong in hoping to host the event.
The WRU also hopes to host a round of the International Rugby Board's Sevens Series in 2015-16.
"The Millennium Stadium is an ideal venue," said WRU chief Roger Lewis.
The 2018 event will include men's and women's competitions.
A successful bid would see the tournament return to the United Kingdom for the first time since Scotland staged the inaugural event in 1993.
Lewis added: "Rugby Sevens has an enormous global appeal, highlighted most recently by its nomination as the newest Olympic sport ahead of Rio 2016.
"Everyone at the WRU will be working extremely hard in the immediate future to ensure we convey that message to the IRB and to the rugby watching world."