Owen Farrell in race for fitness ahead of Leinster quarter-final

Owen Farrell will be given until Friday to prove his fitness for Saracens' Champions Cup quarter-final against Leinster but Billy Vunipola has been ruled out of the trip to Dublin.

Farrell is struggling with a quad problem sustained during England's final NatWest 6 Nations match against Ireland and only returned to light training today with Alex Lozowski on standby to deputise.