The Team Ineos rider – currently competing at the Tirreno-Adriatico in Italy – has cleared up confusion over his admission from the Tour which he famously won in 2018.
“I think there were a number of things – not just one thing you can put your finger on and say it was because of this,” said 34-year-old Thomas.
“There were a load of little things, and it happened that I didn’t feel 100 per cent.
“This may sound bad, but I didn’t want to go to the Tour de France, not be 100 per cent and just ride for the team.”
Thomas, speaking to reporters at the Tirreno-Adriatico, added: “I feel I’m at an age where I definitely want to make the most of all the chances I can get.
“It felt like the Giro was a better fit for me this year.
“I still feel I’m at a level where I can still perform for myself, and so I didn’t want to go the Tour in another role.
“It was a disappointment not to be 100 per cent for the Tour, but I’ve definitely done some good work now. I think the extra six weeks will help me.”
Thomas is relishing another crack at the Giro – which starts on October 3rd – having been in contention in 2017 until a crash.
This year’s route includes three time trials which should suit the Cardiff-born rider who is also planning to ride the TT at the World Championships in Italy later this month.
“Obviously, the Giro was a big goal in 2017, but I crashed out. I always said I wanted to come back again, and so this year is perfect for that.
“It was always in the back of my mind to come back and try to get a GC result.”
“I think I’ll ride the TT at the Worlds, but I don’t think the team wants me to ride the road race,” he said. “We’ll see. We’ll decide things after Tirreno-Adriatico.”