Israel Folau scored a try on debut in his first rugby league match in nearly a decade but despite staying tight-lipped, his first match for Catalans was not without controversy.
Two supporters claim they were asked to take down rainbow flags at the Gilbert Brutus Stadium in Perpignan on Saturday during the Dragons' 36-18 victory over Castleford.
Catalans issued a statement after the match to say: "Rainbow flags are not banned at our club. It is not forbidden. We are gathering more information about what happened."
Folau, who refused interview requests on Saturday, last played rugby league in 2010 for Brisbane before an ill-fated stint with the GWS Giants in the AFL and then a more successful career playing rugby union with the Waratahs and Wallabies which ended abruptly last year after Rugby Australia terminated his contract over his homophobic social media posts.
He scored in the sixth minute when he leapt high to take a Josh Drinkwater bomb to double his team's early 6-0 lead.
The Dragons led 20-12 at the break and kicked on for a comfortable win.
A joint statement from the Super League and RFL, published by Sky Sports, said: "Everyone should have the right to respectfully express their views. We are investigating.
"We will receive a full report by the end of this weekend and have more details on Monday."