ISA Nacewa (pictured) will be in Swansea for the opening night of the PRO12 League on Friday, when Fiji and maybe even New Zealand would rather he was working his way into the World Cup.
It is to Leinster's gain and Fiji's loss that Nacewa, one of the best full-backs in world rugby, has chosen club over country for the next two months.
"I have dedicated my cause to Leinster. I knew come World Cup time I would be here," he remarked, coming in cold from a leg injury that prevented him from playing in two warm-up matches.
The once-capped Fijiian international will be expected to take on a senior role in Joe Schmidt's plan to make a better start to this season than last when the coach oversaw three defeats from the first four rounds.
"I've been around. I am looking at taking the knowledge I have and trying to step up and be a leader. It is one of my main goals this year," said Nacewa.
"The average age of the squad comes down a lot when the international boys are away. But, we've got awesome signings this year."
Like Leinster, the Ospreys chose two preparatory matches, biting the dust 38-10 against French club Lyon and hounding Ireland's World Cup Pool companions Russia (46-19) out of the Liberty Stadium last Friday night.
Leinster will provide a more sturdy test than that with Nacewa surely 'leading from the back'.