Toulouse will wear jerseys with an image of Notre Dame for their clash with Leinster in Dublin on Sunday.
The French outfit will auction off the unique shirts to raise for the famous cathedral's reconstruction after a fire tragically ripped through the landmark on Monday.
As of last night €600m had already been pledged to a fund set up to pay for the rebuilding of the gothic cathedral.
French President Emmanuel Macron told the nation in a televised address: "We will rebuild Notre Dame even more beautifully, and I want it to be completed in five years. We can do it.
"It is up to us to change this disaster into an opportunity to come together."
Toulouse travel to Dublin this weekend to take on the Champions Cup title holders in a clash between the most successful sides in the competition's history.
The sides last met in pool stages in January when Leo Cullen's side ran out 29-13 winners at the RDS Arena.
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