Sam Warburton finds the major problem that undermines this Wales team and calls for selection change

Sam Warburton has explained the key difference between Ireland and Wales.

The former skipper also feels this weekend's clash with Scotland is a must-win match, otherwise Wales could find themselves in a wooden spoon decider with Italy further down the track.

Wayne Pivac's side were comprehensively beaten 29-7 in Dublin last Saturday and had to bank on a Taine Basham intercept to avoid being nilled for the first time in Six Nations history.

It was a gloomy start to a campaign, that always threatened to be difficult, as they were completely overwhelmed.

In his assessment of the match on BBC Six Nations special, Warburton pointed to the quality of Ireland's front five and the momentum they were able to generate.

"I used to get asked when there was a divide between the north and south - what's the big difference?" Said Warburton.

"I used to say that the southern hemisphere have front fives who can carry ball.

"We've got that now and Ireland epitomised that. The Ireland front five made 22 passes to Wales' six. Their handling is really good.

"But, more importantly, rugby is a physical game. The front five gained 110 metres compared to Wales' 27.

"That's where the big difference at the moment, Wales don't have that front five who can carry and break the gainline.

"Ireland have got a front five who can carry, attract defenders and they've got the subtlety have their hands as well to add to their game.

"I'm very impressed with Ireland and there's a little bit of work to do for Wales."

Warburton used clips of Tadhg Furlong's handling during the match and carries from Josh van der Flier and Tadhg Beirne to illustrate his point.

The result of the front five dominance is that Ireland, as fellow pundit John Barclay explained, saw