Tadhg Furlong might not have done Leinster any favours when he opened Mako Vunipola’s eyes to what it takes to be a true, world-class prop, on the 2017 British & Irish Lions tour to New Zealand.

Owen Farrell might have been a leading candidate for a few sleepless nights recently but he is determined not to lose out on his eight hours of shut-eye over the challenge facing Saracens this afternoon