Gravell, who passed away in October 2007 aged 56, won 23 caps for Wales, famously helped Llanelli beat the All Blacks in 1972 and was part of the Grand Slam winning teams of both 1976 and 1978.

He was also a close friend of the Wales national team, a regular at Welsh internationals as part of his TV work as a pitch-side reporter and much loved by everyone in Welsh rugby.

His funeral, held at a packed Stradey Park, was attended by around 10,000 mourners and the players had taken a personal decision to support his charity today.

Gravell's two daughters Gwenan (9) and Manon (12) will lead the team out as mascots at the match tomorrow.

"The boys would do anything for Ray, he was much loved by the team and this was an ideal opportunity for them to show the Welsh fans just how much he meant to them," said Wales team manager Alan Phillips.

"Part of the revenue from every shirt sold will go directly to Ray's charity. We know he would have loved to be with us supporting us on what we hope will be a great day for Welsh rugby.

"He was the Wales team's biggest fan and also one of the greatest servants to the game we have ever had."

The T-shirts are available for £15 online from http://www.cowbois.com.

WALES AND THE GRAND SLAM - THE STATS

Wales were the first nation to complete the Grand Slam when they defeated Ireland in Belfast on 14 March, 1908. Since then they have added eight further titles - 1909, 1911, 1950, 1952, 1971, 1976, 1978 and 2005.

When Wales played in Belfast in 1908 they had to wear trial jerseys without the Prince of Wales feathers because someone packed the wrong kit.

The captains of the Welsh teams in their Grand Slam matches were as follows:
1908 - Bert Winfield (Cardiff) full back; 1909 - Billy Trew (Swansea) centre; 1911- Billy Trew (Swansea) outside half; 1950 - John Gwilliam (Edinburgh Wanderers) No 8; 1952 - John Gwilliam (Edinburgh Wanderers) No 8; 1971 - John Dawes (London Welsh) centre; 1976 - Mervyn Davies (Swansea) No 8; 1978 - Phil Bennett (Llanelli) outside half; 2005 - Michael Owen (Dragons) No 8

- The current Wales skipper, Ryan Jones, is in line to become the fourth No 8 to lead Wales to a championship clean sweep.

- Wales has the best conversion rate when it comes to sealing Grand Slams with nine out of 12 attempts. The three failures came against France in Paris in 1965, in Cardiff in 1988 and against England at Twickenham in 1994. There have been 33 Grand Slams completed over the past 100 years.

- There have also been 21 failures at the final hurdle - 5 each by Ireland and England, 4 each by Scotland and France and 3 by Wales.

GRAND SLAM MISSES ON FINAL DAY: SCOTLAND - lost to England (a) - 1920, SCOTLAND - lost to England (h) - 1923, IRELAND - lost to Wales (a) - 1926, IRELAND - drew with Wales(a) - 1951, ENGLAND - lost to France (a) - 1954, FRANCE - lost to Wales (h) - 1955, WALES - lost to France (a) - 1965, IRELAND - lost to Wales (a) - 1969. FRANCE - lost to Wales (a) - 1978 *, IRELAND - lost to France (a) - 1982, FRANCE - lost to Scotland (a) - 1984 *, WALES - lost to France (h) - 1988, ENGLAND - lost to Scotland (a) - 1990 *, FRANCE - lost to England (a) - 1991 *, WALES - lost to England (a) - 1994, SCOTLAND - lost to England (a) - 1995 * SCOTLAND - lost to England (h) - 1996, ENGLAND - lost to Wales (a) - 1999, ENGLAND - lost to Scotland (a) - 2000, ENGLAND - lost to Ireland (a) - 2001, IRELAND - lost to England (h) - 2003 * * = both sides playing for Grand Slam, Summary (21), IRELAND (1h,4a = 5), ENGLAND (5a = 5), FRANCE (1h,3a = 4), SCOTLAND (2h,2a = 4), WALES (1h,2a = 3)

- England lead with 12 Grand Slams, Wales currently have 9, France 8, Scotland 3 and Ireland 1.

As well as being the 100th anniversary of the first Grand Slam (Wales 1908) this season is also the 60th anniversary of Ireland's one and only Slam (1948), the 40th anniversary of the first Slam achieved by France (1968 in Cardiff) and the 30th anniversary of Wales' triumph over France in the first Grand Slam showdown (i.e. when both teams could take the title on the last day) in 1978.

- The Grand Slam often comes when there is an 8 in the year - Wales - 1908 and 1978; England - 1928, 1980; France - 1968, 1981, 1987, 1998; Scotland - 1984; Ireland - 1948.

- Wales took the Triple Crown for the 19th time in Dublin last weekend in what is the 125th anniversary season of the first Triple Crown, won by England in 1883.

- The fixture on Saturday will celebrate 100 years of internationals between Wales and France. The first game was played at Cardiff Arms Park on 2 March, 1908, when Wales won 36-4.

- Saturday's game will also be the 100th international played by Wales this millennium/century.

- Wales have conceded only two tries to date in the championship. The record for the least number of tries conceded in a Six Nations campaign is four by England - 2002 and 2003.

- Shane Williams is chasing three try records this weekend. Having joined Gareth Thomas as Wales' leading try scorer with his 40th touchdown in Ireland, he needs one more to overtake him.

- With five tries already in the championship he needs one more to join Cardiff wings Reggie Gibbs (1908 Grand Slam season) and Maurice Richards (1969 Triple Crown and championship season) on 6 tries in a season. Gibbs and Richards both scored four tries in one match - Gibbs against France and Richards against England, although they played one game less than Williams in what was then the Five Nations.

- Shane's five tries this championship are already a Welsh Six Nations record - one higher than Rhys Williams' 4 in 2004 - and he is one short of Will Greenwood's Six Nations record of six in a single campaign achieved in 2001.