But his record-breaking Heineken Cup display when Cardiff beat Glasgow three days ago provided graphic confirmation that he was ready for a national squad call-up.

Harris scored 31 points - a Cardiff individual record - collecting three tries and running the show from fly-half. Welsh rugby legend Barry John described his performance as being ‘‘out of this world’’.

The 25-year-old could pull on Wales’ famous number 10 jersey, previously worn with distinction by the likes of John, Phil Bennett and Jonathan Davies, against Argentina in 11 days’ time.

Coach Graham Henry might opt to hold him back for the Tonga clash a week later, yet Harris has made such giant strides in so little time that there seems no point delaying the inevitable.

Henry gave Harris a glowing seal of approval as he prepared to join the national squad.

‘‘Everyone has got to be sensible, but there is nothing I can do to quell all the hysteria surrounding Iestyn,’’ Henry said.

‘‘I am sure Iestyn can handle it. He has captained Wales and his club at the highest levels of rugby league he has been through the mill, and that is a huge advantage for him.

‘‘It was always our intention to fast-track him, and he would have been involved in the squad for these matches, no matter what,’’ Henry added.

‘‘But the fact he has adapted so quickly to a new game is a huge plus for us.’’

Harris and fellow league convert, Cardiff team-mate Anthony Sullivan, are the only uncapped players among Henry’s party.

Sullivan, who also bagged three tries against Glasgow, gained Wales A recognition during a previous stint in union, and will battle with Neath’s Shane Williams for the left-wing position.

Henry has kept faith with the players humiliated by Lloyds TSB Six Nations Championship opponents Ireland earlier this month. Only injured wing Dafydd James, of the 22 on duty that day, misses out.

Number eight Scott Quinnell, lock Ian Gough and wing Gareth Thomas return after missing the 36-6 Irish debacle through injury.

Cardiff provide the biggest single club representation with eight players, while Swansea and Llanelli contribute six each.

Wales squad for Test matches against Argentina, Tonga and Australia from November 10-25:

Backs: K Morgan (Swansea), R Williams (Cardiff), G Thomas (Bridgend), A Bateman (Neath), J Robinson (Cardiff), L Davies (Llanelli), S Williams (Neath), A Sullivan (Cardiff), S Jones (Llanelli), G Henson (Swansea), I Harris (Cardiff), R Howley (Cardiff), D Peel (Llanelli), G Cooper (Bath).

Forwards: I Thomas (Ebbw Vale), C Anthony (Newport), D Morris (Swansea), D Young (Cardiff), R McBryde (Llanelli), B Williams (Neath), A Lewis (Cardiff), I Gough (Newport), A Moore (Swansea), C Wyatt (Llanelli), C Quinnell (Cardiff), C Charvis (Swansea), G Thomas (Bath), B Sinkinson (Neath), G Lewis (Swansea), S Quinnell (Llanelli), N Budgett (Bridgend).