Just hours after revealing he wouldn't be at the wedding, the father-of-three was admitted to hospital for surgery, where he reportedly had three stents placed in his blood vessels after suffering a heart attack.
Although he has yet to meet Harry in person, Thomas told Good Morning Britain that the two have talked on the phone.
Asked about the possibility of a royal baby being soon on the way, he said his daughter had "wanted children for a long time". "There's got to be a child in the making, somewhere soon", he told Good Morning Britain.
He went on to explain how Harry approached asking for Thomas' permission to marry his daughter before news of their engagement broke last fall.
Drama over whether Markle would attend threatened to overshadow the wedding of the 36-year-old American actress to Harry (32) at Windsor last month. "As he said, it cost him, really, the trip to go walk his daughter down the aisle because all the stress and pressure from his own bad behavior boiled over and he couldn't get the flight".
Markle revealed that Prince Harry called him and told him of his intentions and wanted his permission to marry his daughter. "We're really anxious about you.' They said the important thing is that I get better".
He said he realised it was a serious mistakes and apologised to his daughter and son-in-law.
"I was jealous", he added. I can say I'm sorry for those things for the rest of my life, but I'm paying for those things for the rest of my life.
"It was just a loose conversation about something that we have to try, there was no real commitment to it", Markle said about his conversation with the prince. "Hard to take it back", Thomas said.