Twickenham will host the European Champions Cup and Challenge Cup Finals next month.
Ulster are in the running to reach the Challenge Cup decider, which will be held at 8pm on Friday 21st of May.
The Heineken Champions Cup final, which could involve Leinster, will be staged a day later, on Saturday 22nd of May at 4.45pm.
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Up to 10 thousand fans will be allowed in to see both games.
Marseille was due to showcase both finals, but it will be the host city for the 2022 deciders.
Ulster play Leicester in the Challenge Cup semi finals tonight.
