Scarlets could be without full-back Liam Williams for the rest of the regular Pro12 season.
He missed the 25-16 win over Ospreys after suffering a hamstring strain in Wales’s Six Nations win over Italy.
“Four to six weeks is what we’ve been told, so don’t expect to see him over the next few weeks,” said head coach Wayne Pivac.
However, centre Scott Williams could return against Newport Gwent Dragons on 30 April.
Pivac has hardly seen Liam Williams in a regional jersey this season.
He played the first hour of January’s Pro12 match in Connacht after returning from the ankle injury he aggravated during the 2015 World Cup, but then returned to Wales duties.
“Sixty minutes, that’s all we’ve had, it’s very disappointing but there’s no-one more disappointed than Liam,” he admitted.
“We’ve got to get him right for the latter part of the round-robin and who knows, with any luck there could be more rugby to come.”
The Scarlets are well placed to feature in the semi-finals of the Pro12 on the third weekend in May after beating the Ospreys.
Replacement fly-half Aled Thomas profited from their forward dominance by kicking four late penalties to seal the win.
Meanwhile centre Scott Williams, another World Cup casualty with a knee injury, is scheduled to return for the region at the Principality Stadium on “Judgement Day”.
“He’ll be available for the Dragons (match), and we’re working out whether we play him the week before at a lower level,” added Pivac.
Praise for pack
The New Zealander praised his pack after the win over Ospreys, which saw the Scarlets cement their place in the top three of the Pro12.
“Our scrum got on top as the game wore on and won some penalties which gave us field position and kicking some points from those penalties as well – which was ultimately the difference between the two teams,” he said.
“We’ll celebrate this one but there’s another big one in seven days time against Cardiff Blues.”