The Chairman of the Invictus Games Foundation says he has no doubts over the Duke of Sussex's commitment to the tournament.
Prince Harry and his wife Meghan stated they remain committed to their patronages, despite announcing they will step down as "senior" royals, of which the Invictus Games is one.
The couple made their first public appearance together while at the competition in Toronto, Canada in 2017.
Sir Keith Mills said he "can't see [Prince Harry] walking away" from the tournament he created in 2014.
"He was there right at the beginning, it is his idea," Invictus Games Foundation chairman, Sir Keith said.
"He's completely engaged... I don't see any change, frankly, going forward, irrespective of what he ultimately does within the Royal Family."
Sir Keith also said the Duke of Sussex's "passion" is one of his "unique assets".
"I don't think there's any question that he won't be involved," Sir Keith went on to say.
"He does bring some unique assets to the games, but it's primarily his passion - he knows a lot of these competitors personally.
"When he asked me to get involved in the beginning, he took me to Headley Court and showed me how sport is part of the recovery process and how important it was.
"He really gets this and I don't see him walking away from this at any time."
Sir Keith was speaking after the announcement that Dusseldorf will host the Games in 2022.
He said the German city was selected after more than a year of talks.
"There are a number of countries that applied for 2022," Sir Keith told Forces News.
"Our friends in [the Canadian city of Victoria] put a fantastic bid together, but at the end of the day, we thought it would be a wonderful opportunity to take the Invictus Games to a country that hasn't yet hosted one.
"Germany has been selected and I think they'll do a fantastic job."
This year's tournament will get underway in May in The Hague, the Netherlands.