Mark McCall commended Billy Vunipola for his display against Leinster after a difficult period for the England international.
Billy Vunipola played a big hand in Saracens regaining the European Champions Cup after being booed in Newcastle.
As two European heavyweights lock horns in the Champions Cup final, we look at the key battles that will decide Leinster versus Saracens.
After Billy Vunipola was confronted by a fan in a Munster shirt on Saturday, the Irish province distanced themselves from the supporter.
After the controversy surrounding his support for Israel Folau, Billy Vunipola declared himself "grateful" to be playing for Saracens.
Michael Rhodes and Billy Vunipola scored tries but Owen Farrell's 22 points from the tee were key for Saracens against Munster.
The RFU has issued England's Billy Vunipola with a formal warning for "conduct prejudicial to the interests of the union or the game".
Billy Vunipola has been formally warned by Saracens after his defence of Israel Folau's controversial social media posts.
Billy Vunipola's support of Israel Folau has been condemned by the Rugby Football Union and Saracens.
Israel Folau is set to be sacked for his controversial social media posts, but Billy Vunipola has sympathy for the dual-code international.
Eddie Jones says psychology has been an issue for England since the last World Cup, but Billy Vunipola sees it differently.
Owen Farrell has come in for criticism after a poor second half against Scotland, but Billy Vunipola says it is unwarranted.
Billy Vunipola will take more motivation from England's response to the 2015 Rugby World Cup than from the disappointment.
Owen Farrell can thrive as captain in the absence of Dylan Hartley as England begin their Six Nations campaign against Ireland.
Returning to action after a broken arm proved an anxious experience for Saracens' Billy Vunipola, who is steadily regaining his poise.
Saracens welcomed Billy Vunipola back for Friday's trip to Sale Sharks but he could not inspire them to Premiership victory.