Modeled after the Warrior Games in the US, the Invictus Games were founded by Harry in 2014 to offer wounded veterans the challenge of competing in sports events similar to the Paralympics.
Richard Fitzwilliams told GB News the Games have become "too royal" because of Harry and his wife Meghan Markle.
He said: "Mike Tindall, who is the husband of Zara, the King's niece, has been given a high position to do something about the Invictus Games.
"I think Harry is absolutely furious about this. It has been announced, but very quietly."
Mike Tindall has reportedly been handed a "high position" in Harry's charity (Image: Getty)
Fitzwilliams added: "Some people say they want Harry because he's the beginning of the whole Invictus Games, and other people say that it would be delightful that they don't do all this nonsense and they don't want Meghan making speeches. They don't want her leading marches.
"She did lead people who were in winning last year, and she walked as if she was at a dress show and they were walking behind her looking very angry because she doesn't really know very much about the army and the military."
The royal expert added a reconciliation between Harry and the rest of the family is unlikely to happen due to the Duke of Sussex "rushing off" to be with Meghan after the event on May 8, which will be held in London.
Fitzwilliams said: "He won't be going to see his father or brother. It's said that he won't be here for very long."
Prince Harry will return to the UK next month to attend an event at Invictus Games (Image: Getty)
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The Duke of Sussex is reportedly set to make an appearance in person at an upcoming event, despite earlier considerations of joining via video link due to security worries.
He faced a setback recently when his attempt to challenge the Home Office over police protection was rejected, stripping him of the entitlement to royal security services.
Despite the controversies, Harry will return to the UK next month to attend the Invictus Games event, which he established in 2014 alongside the Ministry of Defence.
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