Shane Williams is to make an emotional return to the Principality Stadium with home club Amman United on Sunday.
Wales' record try-scorer and former World Player of the Year, who is 40 years old, has been named to face Caerphilly in the National Bowl final.
Williams played in their 29-3 semi-final win over Cardigan and has since recovered from a hairline fracture to his jaw.
He last played at the showpiece ground for Barbarians v Wales in 2012.
Before that, Williams had ended his Wales career with a try in defeat by Australia in November, 2011.
Williams' brother Dean will play right wing with Shane in the familiar 11 jersey with their brother-in-law Gavin Lewis at full-back.
The score was 0-0 when Williams came on as a replacement against Cardigan for his own brother-in-law.
"I had a bang on the jaw a couple of weeks ago in the semi-final, but I've managed to make myself available for this," Williams told BBC Wales Sport.
"My priority has been helping Amman get to the final. I've been coaching and helping out and played a number of games and we've been able to do that.
"All credit goes to the lads. They've had a great season, they've worked hard and it's all local lads as well that have really got themselves into this final.
"It's very little to do with me and I keep telling them that."
Having knocked out holders Burry Port in the previous round, Amman will face Caerphilly in the final, after they beat Cilfynydd in the other last four match.
Williams made his first senior rugby appearance as a scrum-half for Amman United in 1997 and admitted Sunday would be a special day for the club.
"This is their World Cup final and they are treating it like that," said Williams.
"This means everything to the boys. A lot of them will never get this opportunity again.
"The majority of the Amman Valley is going to be there. All the tickets and buses are booked as well and they can't wait to get there and show their support.
"The town is buzzing and that is great."
Williams went on to play for Neath, and Ospreys and won 87 caps for Wales as well as touring with the British & Irish Lions in 2005, 2009 and 2013.
He scored a record 58 Test tries for Wales and two for the Lions and was named World Player of the Year in 2008, the year he won his second Six Nations Grand Slam.
Surprise Lions call-up in 2013
After quitting Test rugby Williams went on to finish the 2011-12 season with Ospreys.
But after initially retiring from the game, was persuaded to go to Japan to play in their second tier for Mitsubishi Dynaboars.
While there, he received a surprise Lions call-up at the age of 36 to play in a midweek game on their 2013 tour to Australia.
Williams became Dynaboars player-coach in 2014 before ending his professional playing days with them.
The Bowl is the third-tier competition in the WRU's knock-out competitions.
RGC 1404 will play Pontypridd in the top-tier final while Ystalyfera will take on Penallta in the second-tier Plate final.