By Bill Johnstone BBC Radio Scotland rugby commentator in Argentina

He wasn't exactly grim-faced when he announced the line-up for Saturday's second Test, but there was a marked absence of levity in Frank Hadden's demeanour.

You might expect that at such a time, but there is no doubt the head coach is now really feeling the pressure as kick-off between the Scots and Argentina draws near.

And yet, everything he spoke of was managed with a positive slant to it.

Of the key change at stand-off he said: "Phil Godman has been playing consistently well for some time now.

Godman gets the chance to impress in the number 10 shirt

"We have surrounded him with the familiar faces of his Edinburgh Rugby team-mates.

"We know he has world-class passing skills."

And so on - a positive face on a contentious selection.

Hadden knows there are those calling for his scalp; that he has done what he can to take the team forward and it is now time for him to step down.

However, he maintains an upbeat view of the task that lies ahead and I rather admire that.

Godman will lie flatter and take the ball nearer the advantage line. That's his style. The hope then is the Scottish midfield and breakaways can get more 'go forward' ball to work off.

Hadden again acknowledged that the breakdowns last week had been an area of major concern.

Reviews of some breakdowns suggested that more than once the referee, Ireland's Alan Lewis, missed blatant offsides, which led to Mike Blair being unceremoniously scragged and possession spoiled.

"I hope John Barclay can be more effective for us in this area," he said.

MY SPORT: DEBATE Can Scotland win the second Test in Argentina?

Barclay, of course, has that extra yard of pace which allows him to contest breakdowns earlier than most others, but he can't do it alone.

And, intriguingly, in a later conversation I had with Andy Robinson, the forwards coach, suggested Scotland have significantly tweaked and retuned their approach to retaining and winning ball in the contact situation.

Look out for improvements here, with the focus firmly on Barclay.

Robinson talking rugby reminds me of some Western gunslinger approaching a duel in the sun - narrowed eyes, furrowed brows, unsmiling, and not looking to come in second.

Ireland's Alain Roland is refereeing the second Test in Buenos Aires. He cannot be approached by the Scottish management with a wishlist of areas for his 'special attention', like Argentines poaching round the sides of the ruck.

But by one means or another he will have been made aware of the Scots' unhappiness with some of last week's decisions.

It will be a little cameo within the bigger game to see if he allows Barclay and Blair a fair chance to operate fairly.

If offside is not policed rigorously, then the game becomes meaningless. The connoisseurs will enjoy that little sub-plot.

Of the midfield Hadden mentioned that "Graeme Morison is playing too well to be left out", quashing any thoughts of Edinburgh's Nick de Luca joining the starting line-up.

Paterson will win his 88th cap for Scotland in Buenos Aires

The 24-year-old is on the bench this time round, however, and will surely collect his fourth cap at some stage.

As to the selection of Chris Paterson on the right wing for the 18th time, Hadden said: "Chris is versatile, and we must use his flexibility. We're looking for the win, not looking any further. We'll take it any way we can."

Saturday's Test is a milestone for Paterson as we all know. His 88th cap will signal a new Scottish caps record.

It's a wonderful achievement for one of the game's most unassuming gentlemen. Rugby players all over the world will applaude his achievement, and so they should.

He has racked up 671 points so far in Test games and Scots will have their fingers crossed he can add some more.

Paterson may appear quiet, but don't be fooled by that. He's every bit the hardened professional and winning is what it is all about for him. Last week's defeat hurt deeply.

And by the way, it's going to be Mike Blair's 50th cap, another reason perhaps why the Scottish captain will be very keen to turn the tables on those irritating Argentine forwards who collared him so regularly in Rosario.

Blair's 50 puts him into a select group of Scottish players who have reached their half century. Earlier this season Andy Henderson, Nathan Hines, and Gavin Kerr all joined that growing group.

And so to Velez Sarsfield Stadium. I can't wait to see how the Scots approach the challenge. Tension and pulse rates rising. And Frank Hadden and I have that in common, believe me.

You can listen to Bill Johnstone's commentary from Buenos Aires on BBC Radio Scotland from 2000 BST and on the BBC Sport website (UK only).