Loffreda saw his side score six tries as the Pumas beat the tourists 50-44 at Tucuman on Saturday and says the new defensive strategy formulated by Ruddock's expert coach in that area, Clive Griffiths, may have been a major factor.

But Ruddock put the Pumas' success largely down to individual Welsh errors of a schoolboy nature as the two coaches began their mind games ahead of the second Test in Buenos Aires on Saturday.

Loffreda said: I felt the Welsh defence came up too fast and left themselves exposed to their line being broken, maybe.

I was surprised that Wales missed so many tackles. Perhaps it was because of their defensive system.

We also missed tackles when Wales fought back in the last 20 minutes. I think that was about concentration.

In the first half there was an equal balance to the game but we broke that balance in the last five minutes of the opening period with Gonzalo Longo's try.

Both teams did good things in the first-half, but the defensive aspects of the game were different. Both sides were good in the first-half and not so good in the second.

However, Ruddock insisted that he has total confidence in Wales' defensive strategy, stating, We are not blaming Clive Griffiths - he is a brilliant coach. But what we have said is that we are using a new system and interestingly enough, not many of the Argentine tries beat that system.

One came from a charge down, another from a maul that bust us and one or two individual errors. We are certainly very comfortable with where we are going and it´s just a matter of tidying up those things.

We need to tighten up in defence and keep our style going and if we do that it will be a very good tour for us.

These were schoolboy errors really but I've had to bring them to the attention of the team.

It's nothing to do with the defensive system - it's down to poor decision-making and poor execution.

On one occasion after we had mashed their scrum - which was a great bonus for us - Felipe Contepomi ran through the whole pack. At that point we should have been knocking people down like skittles, but instead one of our tight five missed a tackle on him.

Then Contepomi managed to get a good hand-off into Hal Luscombe and went on to the tryline. That was nothing to do with a system, that was down to individual error.

We've had a full debrief with the players of the video. There was a lot of good and a lot of bad and we have to make sure we work on and prioritise the right areas ahead of the second Test.