Wales backs coach Howley said: "It gives us even more motivation for tomorrow on what is hopefully going to be a great game for Welsh rugby."
Howley described Davies as a "colossus" and "legend" of the game.
Davies led Wales to the 1976 Five Nations Grand Slam and won 38 consecutive Wales caps and played in eight Tests on the successful British and Irish Lions tours to New Zealand in 1971 and South Africa three years later.
Archive - the Mervyn Davies Story
His rugby career was cut short in 1976 when he suffered a brain haemorrhage playing for Swansea in a Welsh Cup semi-final against Pontypool at Cardiff Arms Park.
Davies won two Grand Slams and three Triple Crowns with Wales and after becoming captain in 1975 led them to the Five Nations Championship that season and the Slam the next.
In his 46 international appearances for Wales and the Lions he only ended on the losing side nine times.
He was widely tipped to captain the 1977 Lions squad but his glittering career was ended at just 29 by the brain haemorrhage.
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