Scotland lock Jim Hamilton has announced his retirement from international rugby.
Saracens have signed former Waratahs hooker Dave Porecki on a short-term deal as cover for the World Cup.
Aviva Premiership champions Saracens will open the defence of their title at home to the Sale Sharks on October 17.
English clubs say they will allow their players to compete at next summer's Olympic Games as part of Great Britain's Sevens team.
Scotland have added Edinburgh duo Dougie Fife and Ben Toolis to their pre-World Cup training squad.
Defending champions Toulon have been drawn in a brutal pool with Bath, Leinster and Wasps in the 2015/16 Champions Cup.
Wasps have completed their ninth signing of the off-season with prop James Johnston joining the club from Aviva Premiership rivals Saracens,
Saracens have appointed Heath Harvey as their new chief executive following the departure of Edward Griffiths.
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