Manu Vunipola, who now works for the Ministry of Sport as a development officer, said he helped host a Welsh delegation which visited the kingdom this month.
Wales is scheduled to play Tonga next year but the venue of the match is dependent on the dilapidated Teufaiva Stadium being renovated in time.
If not, the fixture could be moved to New Zealand.
Vunipola said he was hopeful the game would still be held in Tonga after showing the visitors around.
"We went to the hospital, we went to the hotel," he said.