The booing of England star Billy Vunipola every time he touched the ball in Saracens Premiership loss to Bristol on Saturday "was unexpected" said Sarries director of rugby Mark McCall.

Vunipola sparked a backlash by liking on Instagram -- and subsequent refusal to unlike -- Australian great Israel Folau's post that "Hell awaits" homosexuals, as well as adulterers and drunks, among others.