Connacht coach Michael Bradley sees the announcement of these matches as crucial to his teams preparation for this seasons Magners League campaign.
"Castres and Harlequins are two quality sides and when you consider we'll be playing South Africa the week before Castres, we should find ourselves in a position to hit the ground running once the Magners League kicks off," the former Irish scrum half said.
"We've always tried to get preseason games against stiff opposition and this season is likely to be the toughest we've ever had. It's going to be a great test for us and also great for Connacht supporters to see these sides and we're looking forward to the games already."
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