Leigh Halfpenny could be pulling on the number 15 shirt for Wales after Lee Byrne was injured while playing for Ospreys at the weekend.
Halfpenny scored 11 points to help Cardiff Blues to a 16-12 win over Heineken Cup Pool Six rivals Gloucester, despite playing most of the match a man short after Tom James was sent off.
The 20-year-old has made two appearances on the wing for Wales, but could replace Byrne at full-back for this year's RBS Six Nations title defence.
Byrne is a doubt for Wales' opener against Scotland on February 8 after suffering an ankle injury in Ospreys 17-15 Pool Three loss to Perpignan.
"Lee is a great player. He has been in outstanding form," Halfpenny said.
"I will keep playing the best I can, whether it is wing or full-back. I can't believe what has happened for me so far this season. I am taking it game by game, but inside I am buzzing."
Welsh coach Warren Gatland will announce his squad for the Six Nations on Monday.
Cardiff are now the only team in the Heineken Cup with a 100 per cent record and will secure a home quarter-final with a bonus point victory over Calvisano on Friday.
James was dismissed in the 27th minute for head butting Olivier Azam and could face exclusion from the national squad if he is suspended for his actions.
Cardiff boss David Young was not impressed with the Gloucester hooker's theatrical reaction.
"It was a silly thing for Tom to do. It was more a defensive gesture than an aggressive one. He (Azam) went for the Hollywood, which is something we want to take out of the game.
"When I was playing, you didn't see hookers going down as quickly as that. We don't want players out there looking like soccer players."