Thomas says he has so much to thank former All White Edge for; not just for opening up the doors to a trial at PEC Zwolle, but opening up his house to stay for his three years at St John's College in Hamilton.
"After the Under-20 World Cup in Turkey [2013] Declan got hold of [Zwolle academy coach] Rini Coolen and emailed him a few times, but he said, 'No we can't look at players in New Zealand'," said Thomas. "But Declan kept at him and he said, 'Okay, he has a 10-day trial to impress'. I went over and have stayed ever since."
Thomas played 19 games last season for PEC Zwolle and scored two goals - both now legendary with supporters as they helped bring down mighty AFC Ajax in the 5-1 victory in this year's Dutch (KNVB) Cup final.
He says the noise from the supporters that unforgettable afternoon in April was a shock, in a game halted for half an hour after fans pelted the pitch with flares after Ajax scored the opening goal.
"On the pitch I could not hear a thing," Thomas said. "If I was talking to someone next to me, I had to shout at him. If someone was telling you to turn, you can't hear them. You have to definitely play on instinct and your head has to be on a swivel, knowing what is around you.
"It is a big difference and makes it a lot harder to play, but it was a good experience to have the fans so loud and good for me to learn like that."