Regan King says failure is unthinkable for Llanelli Scarlets as they hunt a Heineken Cup quarter-final berth at Ulster on Saturday…

The ex-All Blacks centre was the Scarlets’ hero in Toulouse in December when he created Nathan Thomas’ winning try which capped the Welsh regions’ 41-34 fightback over in France to leave them unbeaten with four wins.

But the Welsh can still be caught with Ulster and Toulouse chasing their heels and King says the Scarlets must win in Ulster to make their progress certain – failure is not an option.

“With all the hard work we have done, failure now would be unthinkable,” said King.

“We still need a couple more points to qualify, beyond that we want a quarter-final and we are gunning for a win in Ulster, as well as the home game against London Irish the week after.”

A win at Ulster’s Ravenhill on Saturday will make the following week’s match at Stradey Park against London Irish a mere formality, but form is not on the Scarlets side.

They had a terrible Christmas as they followed up the historic win in Toulouse with three emphatic defeats at the Ospreys, Cardiff Blues and Edinburgh, but King says they must put their recent poor form aside.

“Results haven’t got our way in the Magners League, but we have to forget that and get our show back on the road quickly, we must win in Belfast.

“It’s an exciting time to be on the verge of our first quarter-final for three years. It’s at the back of our minds all the time, first and foremost, we have to get there.

“We are just looking forward to the next two games.”

Injury to Ulster’s chief play-maker and goal-kicker David Humphreys has helped the Scarlets cause, but King expects a battle royal in Belfast on Saturday.

Morgan Stoddart is the shock inclusion at full-back and the 22-year-old has been in stunning form with the Llanelli semi-pro side and has been plucked from obscurity for his full debut.

The Treorchy product has been chosen for the No 15 shirt ahead of Wales caps Barry Davies and Garan Evans.

“Morgan deserves his chance with the Scarlets,” said Scarlets’ director of Rugby Phil Davies.

“He’s been in great form for the semi-pro side. He’s strong and elusive and offers us something different.”