England prop Mako Vunipola will miss Saracens' quest for a Premiership title this season after suffering a 'serious' hamstring injury.
The 28-year-old suffered the injury during the European Champions Cup final win over Leinster at St James' Park during which he was replaced in the 30th minute.
Saracens director of rugby Mark McCall has confirmed that Vunipola is doubtful for the remainder of the season but is expected to be fit for England's World Cup campaign.
Meanwhile, Titi Lamositele, who suffered an ankle injury will miss the remainder of season.
“Mako has torn a hamstring and is waiting to see exactly what’s happened but I would very much doubt he’d play again this season,” he said. “Titi also won’t play again this season.
“He [Mako] won’t be out of the World Cup. He will be out for a while though, it is quite a significant injury.
“Obviously it’s disappointing to lose two players like that and it makes us a little bit vulnerable, to be honest.”
Saracens have already secured a home play-off in the ongoing Gallagher Premiership after securing 16 wins from 21 games and will face Worcester Warriors in the final round at Sixways on Saturday.