Northampton centre Tom Stephenson will be out of action for several months after breaking his leg in a friendly.
Northampton have signed Argentina centre Juan Pablo Estelles ahead of the new Premiership season.
Teimana Harrison and Paul Hill are among six players to have signed new contracts with Northampton.
Saracens will start their Premiership title defence against Worcester in the London double header on September 3.
Former England Saxons centre Dominic Waldouck will join Newcastle Falcons on trial.
Champions Cup holders Saracens have been drawn against Toulon while Bath will meet Bristol in the Challenge Cup.
James Haskell hopes Dylan Hartley's detractors have been silenced by the sensational start to his captaincy of England.
Tom Wood has been named Northampton captain for the new season.
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Barbarians v South Africa
5th November 2016