Routine medical tests on ex-All Black Sione Lauaki have shown up heart and kidney problems.
Lauaki, who has 17 All Black test matches to his name, now plays for French rugby team Bayonne.
But it has ordered the loose forward off the field for the rest of the season, after a routine biological assessment at the end of January showed up heart and kidney problems.
After consulting specialists in Bayonne, Lauaki was now planning on travelling to London for further opinion.
"I've seen specialists in Bayonne and Bordeaux, and after having consulted with each other and the Bayonne team doctor, we agreed it was important to get another medical opinion," Lauaki told French newspaper L'Equipe.