Harlequins forward Will Collier has been ruled out for the rest of the season with a ruptured cruciate ligament.
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Scotland have confirmed David Denton and Sean Maitland will miss the start of the Six Nations through injury.
Former Australia coach Robbie Deans will take charge of the Barbarians for matches against Ireland and England in May.
Forwards Tom Croft and Christian Day have been called up to England's RBS 6 Nations training squad as injury cover.
John Carver is the 2/1 favourite to be in charge of Newcastle on the first day of next season - our blog has this and more.
Brad Barritt and Luther Burrell are England's latest injury concerns, handing Stuart Lancaster a serious shortage at centre.
Scottish Rugby Union chief executive Mark Dodson has defended Vern Cotter's decision to include Hugh Blake in his squad.
Wales centre Scott Williams admits he was surprised by the international retirement of prop Adam Jones.
Ireland chiefs remain hopeful Eoin Reddan will beat his medial knee ligament strain in time to face Italy in the Six Nations.