Worcester lock Tevita Cavubati and Leicester forward Dom Barrow have been banned for nine and two weeks respectively.
Worcester Warriors have signed South Africa flanker Dewald Potgieter and he could make his debut this weekend.
London Irish lifted themselves off the bottom of the Premiership with a 20-13 victory over fellow strugglers Worcester.
Topsy Ojo makes his 250th appearance for London Irish on Sunday when they face fellow strugglers Worcester.
Exeter produced a powerful second-half performance to beat Worcester 30-15 in their Aviva Premiership clash at Sixways.
Rob Baxter predicts a titanic battle when the Chiefs host Saracens in next Sunday's top-of-the-table Premiership clash.
Worcester have secured the permanent signing of back-row forward Marco Mama from Bristol ahead of the 2016/17 campaign.
Alex Grove has joined Championship side London Scottish on loan from Worcester.
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Barbarians v South Africa
5th November 2016