The 25-year-old picked up the injury in his club side's 15-15 draw with Ospreys in the European Champions Cup on Saturday evening, forcing him to make way midway through the match.
This clip is originally from Rugby Union Weekly, 15 January 2018.
North and South Korea discuss troupe's Olympics visit
Monday of "throwing cold water on an atmosphere of reconciliation" by continuing to emphasize sanctions against Pyongyang. South Korean President Moon Jae-in has said denuclearization will remain the central goal in Seoul's North Korea efforts.
It not only leaves Saracens without one of their best players again this season - having only deployed Vunipola four times this season in which two of those ended in long-term injury - but also robs England of their starting No 8 just three weeks before the Six Nations begins.
Saracens have confirmed that the England global is facing a prolonged spell on the sidelines, however, effectively ruling him out of the Six Nations, which begins in less than three weeks' time.
England scrum-half Danny Care says Billy Vunipola's latest injury will deprive the squad of "one of the best players in the world". Saracens released a bulletin mid-afternoon on Sunday but have not put a timeline of recovery until Vunipola sees a specialist later in the week.
Funeral service honors murdered OC student Blaze Bernstein
The affidavit claimed Woodward told investigators he and Bernstein drove to the park, where Bernstein left to meet a third person. Witnesses said he was last seen at approximately 11 p.m the night before, entering Borrego Park in Foothill Ranch with a friend.
He is due to see a specialist this week but is expected to miss England's first Six Nations game against Italy on February 4 and potentially more matches beyond.
Meanwhile, England flanker James Haskell was sent off for a unsafe tackle on Jamie Roberts in Wasps' defeat to Harlequins and a ban could render him unavailable for selection by Jones.
Aggressive Konta makes light work of Brengle
Johanna Konta began her Australian Open campaign in comfortable fashion with a 6-3 6-1 victory over American Madison Brengle. I knew it was going to be tough, she gets a lot of balls back.