Wales boss Wayne Pivac has described Alun Wyn Jones and Richie McCaw as "immense players" as they prepare to share a world record.
Wales captain Jones will make his 148th Test match appearance, which includes nine for the British and Irish Lions, when he leads his team against Guinness Six Nations opponents Scotland on Saturday.
It means that he equals New Zealand World Cup-winning skipper McCaw's world-best for international appearances in rugby union.
And there is every chance that 34-year-old Jones could break it at Eden Park in Auckland when Wales tour New Zealand this summer.
I find him (Jones) a pleasure to work with. The way I would like all players to be. If he is not sure on things he will certainly let you know - he will ask questions, and they are all positive questions.
Pivac's first tournament at the helm since succeeding Warren Gatland as head coach will end on Saturday, with Wales striving to avoid a fourth successive defeat following losses to Ireland, France and England.
Meanwhile, he expects a tough test against Scotland, with Gregor Townsend's team arriving in Cardiff after destroying French Grand Slam hopes last weekend.
They have obviously reviewed how that (World Cup) went, and they had the unfortunate weather in the England game, so you can't take too much out of that. They ran Ireland very, very close and had a comfortable win in Italy.