The injury to Jonathan Davies was pivotal to Wales' selection for their 24-16 win in Italy last Saturday.
David Lyons and then Jonathan Davies went over but a missed conversion left them needing another try to win.
Jamie Roberts, James Hook and Jonathan Davies are now Wales' only fit centres.
The Scarlets will be able to choose between hookers Rees and Owens and can also call on centre Jonathan Davies.
Jones is absent along with fellow Wales squad members Matthew Rees, Dafydd Jones, Martin Roberts, Jonathan Davies and Mark Jones.
They repeatedly battered at the line, only to see that attack break down as Jonathan Davies dropped the ball in midfield.
Uncapped Scarlets back-rowers Rob McCusker and Josh Turnbull, plus centre Jonathan Davies have been included in Wales' squad to tour North America.
But Scarlets exploited the numbers when visiting prop Ronan Loughney was sin-binned, Jonathan Davies crossing for his second try before Lamont struck.
Jonathan Davies, Ieuan Evans and Carwyn Davies played for a Patagonian team in the Argentine National Sevens tournament in the late 1980s.
Evans' views were supported by former Wales captain and outside-half Jonathan Davies.
Jonathan Davies of the Scarlets is likely to be the new man in midfield when Wales coach Warren Gatland names his side on Thursday.
But Gatland does have more strength in depth at centre with experienced pair Andrew Bishop and Tom Shanklin joined by young Scarlet Jonathan Davies.
Andrew Trimble (2) and Tomoci Nagusa went over to secure the bonus point while Jonathan Davies scored the first try for the Welsh visitors.
"I would like to see Hooky play 10 personally - I'd put Jamie Roberts and Jonathan Davies at centre, " Devereux told Scrum V Radio.
She said the Great North Run fundraising project with Jonathan Davies and his wife had been one of the biggest individual efforts backing their campaign.
Clare Balding will present BBC's TV coverage alongside studio guests Brian Noble and Justin Morgan, with match commentary coming from Dave Woods and Jonathan Davies.
The centers are O'Driscoll, Jonathan Davies, Jamie Roberts, and Manusamoa Tuilagi.
In sharp contrast was the broad grin of delighted Welsh pundit and former international Jonathan Davies - his smile reflecting the triumphant mood of the nation.
The Crusaders call the move "the only realistic option to ensure the survival of the club", but Jonathan Davies says it leaves them open to criticism.
The Welsh side led by Richard Moriarty, coached by Tony Gray and including Jonathan Davies finished third after beating Australia 22-21 in the third-place play-off in Rotorua.
Players Mike Phillips, Jamie Roberts and Jonathan Davies were among those tweeting following the win, sharing pictures of themselves with their winners' medals in the dressing room.
Wales hit back after half-time as a fine pass back inside from Jonathan Davies allowed Halfpenny to break through, then a line-out catch and drive shoved Hobbs over.
Jonathan Davies' hamstring strain means James Hook moves from fly-half to centre to win his 50th cap and Stephen Jones is back for his 98th cap at 10.
After a period of scrappy play, the Scarlets suddenly found themselves back in the game thanks to a move started by Jonathan Davies' surge into the Leinster half.
Sexton again converted the 19th-minute try, but was kicking his heels in the sin-bin seven minutes later after kicking the ball away following his try-saving tackle on Jonathan Davies.
There would also be question marks over the futures of Rees and centres Jonathan Davies and Regan King, who would be targets for teams playing in the Heineken Cup.
The Premiership and other leagues feeding into the regions are generally considered to be performing inadequately, with pundits like Jonathan Davies calling for major reforms from the grassroots up.
Describing the performance as "unbelieveable", Welsh rugby legend Jonathan Davies paid tribute to Shane Williams who claimed the Welsh try-scoring record with his sixth of the tournament during the game.
He lines up in a reshaped back division that sees James Hook at full-back, Morgan Stoddart on the other wing and fit-again Jamie Roberts forging a midfield partnership with Jonathan Davies.
Yet despite being on the front foot - Jonathan Davies and Andy Fenby in particular making pleasing half-breaks in the backline - the Scarlets were unable to turn their dominance into points.
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