The 27-year-old missed the semi-final victory over London Wasps with an ankle injury, but is ready to start in Marseille.

Rees featured in the RBS 6 Nations and was named in Wales’ squad for next month’s Tests against South Africa and New Zealand.

And despite Rees declaring himself fit, Blues coach Dai Young is under no illusions of the task facing his side with a Toulon team packed with international quality including England fly-half Jonny Wilkinson and All Blacks legend Tana Umaga.

“This is the biggest game since the region was born,” said Young.

“We have shown we have the mettle and determination to go to tough places and get a result, and it won't get much more difficult than this weekend.

“We won't have to worry too much about the 50,000 in the stand but the 15 on the pitch will be tough enough.

“Toulon are one of France's top teams who have very few weaknesses and few unrecognisable players.

“But we do think there are one or two areas we can expose and we're looking forward to the game.”