Harlequins have named Danny Care as skipper for the upcoming season.
Harlequins have completed the signing of No 8 Mathew Luamanu from Guinness Pro 12 side Benetton Treviso.
English clubs say they will allow their players to compete at next summer's Olympic Games as part of Great Britain's Sevens team.
Harlequins and England centre Jordan Turner-Hall has been forced to retire from rugby at the age of 27 due to injury.
Aviva Premiership champions Saracens will open the defence of their title at home to the Sale Sharks on October 17.
England captain Chris Robshaw insists being World Cup hosts is a huge advantage.
Harlequins and England centre Jordan Turner-Hall has been charged with GBH following a nightclub incident in October.
European Challenge Cup holders Gloucester will face local rivals Worcester Warriors in the 2015-16 competition.
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