Ireland and Munster legend Ronan O'Gara to reassure concerned followers that he and his young family are safe.
The game involving Racing Metro, where O'Gara is an assistant coach, and Glasgow Warriors which was scheduled to go ahead today in Paris has been postponed along with every Champions Cup and Challenge Cup rugby game taking place in France.
O'Gara allayed fans fears over his safety and immediately paid tribute to the families who have lost loved ones in the Paris terrorist attacks.
He tweeted: "Thanks for all the messages. We are all ok thank god but other families are not so lucky this morning."
Thanks for all the messages.We are all ok thank god but other families are not so lucky this morning.— Ronan O Gara (@RonanOGara10) November 14, 2015
Ulster's game with Oyonnax was among those called off in the wake of the tragic events in the French capital.
In a statement Ulster Rugby said: "Due to the tragic events last night in Paris and the current period of national mourning in France, EPCR has decided to postpone this weekend's European Rugby Champions Cup and Challenge Cup matches scheduled to be played in France.
"Therefore, today's game between Oyonnax and Ulster Rugby has been postponed and will be rescheduled for a later date. We will provide updates on the situation as soon as they become available.
"Ulster Rugby extends its sincerest sympathies to everyone affected by the Paris attacks.
"Thanks to the fantastic supporters who have made the trip to Oyannax for the fixture."