Prince Harry is allegedly pressuring Meghan Markle to do one thing she doesn't like to do, according to a royal expert.

The Duke and Duchess of Sussex quit their royal duties in 2020 and settled in California. Previous reports claimed that the former "Suits" star had no plans to return to her husband's home country. Markle didn't join Prince Harry during King Charles' coronation and when he visited his father following his cancer diagnosis.

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Prince Harry, Duke of Sussex and Meghan, Duchess of Sussex wave from the Ascot Landau Carriage during their carriage procession on Castle Hill outside Windsor Castle in Windsor, on May 19, 2018 after their wedding ceremony.

However, Prince Harry is expected to return to the United Kingdom for the 10th anniversary of the Invictus Games. Tom Quinn, royal commentator and author of "Kensington Palace: An Intimate Memoir from Queen Mary to Meghan Markle Tom Quinn," weighed in on how the upcoming trip would affect his marriage to Markle since he's been allegedly pressuring her to join him on his next U.K. visit.

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Prince Harry and Meghan Markle, Duke and Duchess of Sussex leave after a service of thanksgiving for the reign of Queen Elizabeth II at St Paul's Cathedral in London, Friday, June 3, 2022 on the second of four days of celebrations to mark the Platinum Jubilee.

"The Invictus Games -- it's one of the few areas of Harry's life where he feels on firm ground," Quinn exclusively told Mirror. "There's no doubt that helping disabled soldiers is a good thing, and it's something that Harry has tried to do without it becoming all about him, so it's good for brand Sussex, but only if Meghan is also there. So he is definitely putting pressure on her to join him."

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Prince Harry and Meghan Markle attend a reception for young people at the Palace of Holyroodhouse on February 13, 2018 in Edinburgh, Scotland.

The pressure could reportedly put a strain on their relationship. But Markle might change her mind as the visit would also mean she could see her ill father-in-law, King Charles.

"This is causing huge tension in the couple's relationship. Omid Scobie's book 'Endgame' tells us that Meghan never wants to visit the U.K. again, but she now realizes with the games coming up and her father-in-law seriously ill that you should never say never," Quinn continued.

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Britain's Prince Harry, Duke of Sussex, (R) and Britain's Meghan, Duchess of Sussex (C) meet guests pre-ceremony reception as they attend the annual Endeavour Fund Awards at Drapers Hall in London on February 7, 2019.

Meanwhile, Jennie Bond, English journalist and former royal correspondent for the BBC for 14 years, said Markle might only meet with a few royals -- probably three -- if she were to return to the U.K. The other family members would reportedly consider their loyalty to Prince William and Kate Middleton before seeing the Sussexes.

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Prince Harry, Duke of Sussex, Meghan, Duchess of Sussex and their baby son Archie Mountbatten-Windsor meet Archbishop Desmond Tutu and his daughter Thandeka Tutu-Gxashe at the Desmond & Leah Tutu Legacy Foundation during their royal tour of South Africa on September 25, 2019 in Cape Town, South Africa.

"They could be confined, I think, to meetings with [King] Charles -- and perhaps [Princesses] Eugenie and Beatrice. The rest of the family would have to think hard about the implications of meeting Harry and Meghan," Bond told Mirror.