Johnny Sexton and Ross Byrne doubts for Toulon clash

Johnny Sexton and Ross Byrne celebrate Leinster's Guinness PRO14 final win

Leinster coach Leo Cullen is sweating on the fitness of both Johnny Sexton and Ross Byrne for Friday's Heineken Champions Cup last-16 clash with Toulon.

Sexton has entered the Graduated Return to Play Protocols following an injury he sustained in Saturday's Guinness PRO14 final win over Munster. He will be assessed as the week progresses.