George blow for England and Sarries
England reserve hooker Jamie George will miss the remainder of the Six Nations and may struggle to be ready in time for the summer tour to Australia.
George ruptured a biceps tendon during training on Tuesday and a scan has revealed he will be sidelined for eight to 10 weeks, ruling him out of this weekend's likely title decider against Wales and the clash with France one week later.
Luke Cowan-Dickie of Exeter will supply cover for captain Dylan Hartley from the bench as George begins a spell of rehabilitation.
If the worst-case scenario unfolds, the earliest he could return for Saracens would be the Aviva Premiership semi-final on May 22 and England depart for Australia three days after the final, which is being staged at Twickenham the following weekend.
Forwards coach Steve Borthwick said: "On the video of the training session, I watched the incident and it looked very innocuous. It was an arm out during a tackle and that was it.
Cowan-Dickie won his solitary cap against France in the build-up to last autumn's World Cup and is set to play only a minor supporting role at Twickenham on Saturday, unless Hartley is struck by injury early.
Meanwhile, Connacht's John Cooney has penned a one-year contract extension to remain at the Sportsground for 2016/17.
The former Leinster No 9 has missed much of the province's groundbreaking season with a shoulder injury, but is expected to return for the run-in.