New Zealand centre Jordie Barrett is set for his debut for Champions Cup runners-up Leinster after joining the Irish club for his sabbatical.
Barrett has joined the four-time winners on a six-month deal, having ended his All Blacks season with defeat to France three weeks ago.
Catch every game of SVNS World Series LIVE, ad-free and on demand on Stan Sport.
"Normally at this time of the year, I'm on a plane heading home to enjoy some time off in the summer but my body’s feeling great," Barrett told Leinster's website this week.
"I'm excited. It can't come quick enough," he added.
They will start their bid to reach the Cardiff final, in the competition's 30th campaign, by heading to Bristol.
Defending champions Toulouse begin the defence of their Champions Cup with a clash against Ulster.
Toulouse hooker Peato Mauvaka is a key weapon in their charge for a seventh title, ending the November internationals on a high having started all three of France's victories to cement his place as his country's first-choice number two.
New Caledonia-born Mauvaka was at the core of Les Bleus' unbeaten series, the only Six Nations side to win all of their games during the month.
During the successes over Japan, New Zealand and Argentina, the 27-year-old also spent some time covering in the back-row.
"It allowed me to work on my physicality and I tried to bring all my energy and good spirit onto the field," he told AFP.
"I really enjoyed it. I now want to do the same thing for the club," he added.
The front-rower, who joined Toulouse aged 15, was rested for last Saturday's Top 14 victory at Racing 92 due to an elbow strain.
"We can't wait to be back in the competition," Mauvaka said.
"It's always a level above the Top 14, we love these matches.
"We know people expect something from us having won last season," he added.
The three South African sides in competition -- the Bulls, the Stormers and the Sharks -- have reached the Champions Cup in the third season of the inclusion of sides from the Rainbow nation.
Siya Kolisi's Sharks qualified by winning last season's Challenge Cup, leading to Welsh side Ospreys missing out despite their superior finish in the United Rugby Championship table.
The Swansea region's absence means that despite the Millenium Stadium in Cardiff hosting the final on May 24, no Welsh side will feature in the top-tier competition for the first time since its inception in 1995, when Cardiff lost to Toulouse in the final, also held in the Welsh capital.
