The former Welsh rugby star was eliminated in last Sunday's (March 3) semi-final after feeling sick and dizzy from practising a 'flying' routine earlier in the week.
Thomas has now revealed that he has finally been cleared by doctors and will return along with all this year's Dancing on Ice contestants for a routine at the final this weekend, although he stressed that his "feet are staying on the floor".
"I've been like a pincushion for the last few days getting all tests and everything kind of cleared, because I just want to get back on the ice on Sunday," he commented during an appearance on ITV's Daybreak.
"It all started on the ice for me, and I want it to end on the ice so I want to do it on Sunday... I'm going to be back on Sunday, yes. But I'm not flying ever again, my feet are staying on the floor... We're not competing, I'm just back for the final. Everybody's coming back."
Thomas went into more detail about how much his ear imbalance and fear of heights had affected him, revealing: "I was like really ill, really vomiting, really head spins.
"I'm afraid of being up in the air, I was upside down, there was a lot of strain, I wasn't breathing, I was really tense."
In spite of the circumstances surrounding his exit, Thomas said that being reinstated for the Dancing on Ice final would have been unfair.
"I didn't want to go through to the final unless I go through fairly," he stated. "As a sportsman, I either go through fairly or I don't go through at all.
"But I just want to be there because we've got all really, really close as a group, and I want to be there to support the three finalists and also to see everyone else again.
"I've had a blast and I've loved every minute of it... I got on the ice for the first time ever months ago and I had a smile, and I didn't stop smiling all the way through until the end, I really didn't."
Matt Lapinskas and Olympians Beth Tweddle and Luke Campbell will compete in the Dancing on Ice final, which airs Sunday (March 10) at 7pm on ITV.
Photo gallery - Dancing on Ice show 9: