Mako Vunipola will miss Saracens’ pursuit of the double after being ruled out for the rest of the season by a “significant” hamstring injury.
“Mako has a torn hamstring. We’re waiting to see exactly what happens with that, but I very much doubt he’ll play again this season. Nether will Titi,” McCall said.
“Mako won’t be out of the World Cup, but he’ll be out for a while. It’s quite a significant injury.
“It’s disappointing to lose two players of that quality and it makes us a little bit vulnerable.”