Munster have confirmed the signing of second row Jean Kleyn from Stormers.
Centre Owen Watkin will miss the majority of Ospreys' upcoming season after suffering a serious knee injury in training.
Edinburgh Rugby have signed Tonga back-row Viliami Fihaki on a two-year deal.
Scotland international Hugh Blake has signed for the Bay of Plenty Steamers ahead of the upcoming Mitre 10 Cup.
Reigning champions Connacht will launch the defence of their Guinness PRO12 title against Glasgow Warriors.
Scarlets prop Samson Lee will miss the start of the Guinness PRO12 season after undergoing shoulder surgery.
Leinster have re-signed utility back Niall Morris on a short-term contract from Leicester Tigers.
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