The Welsh performer admitted that bosses provided the coaches with 'suggested lines' when giving feedback to the acts.
But the BBC insisted that the generic comments were simply to help out the coaches if they were struggling during filming.
“I feel like I know what I am doing this time and it feels more natural," Sir Tom told the Radio Times this weeek. “Last year we were given suggested lines just in case we got stuck, which I tried to work in on a few occasions.
“But even when I tried to say them naturally I knew that they weren’t me and felt self-conscious.
“I have learnt now that I don’t have to do that, I can just say what I feel.”
Speaking to The Sun, a show insider revealed: “We never wanted the coaches to feel stuck for how to respond to singers so suggested they had a few phrases they could draw on if necessary in order to prepare them for the shows.
“They were always encouraged to be themselves and speak in their own voices. This was simply guidance to prepare them for television.
“They absolutely never knew who was up next to audition or told how to respond to those people.”
And a spokesperson for the show added: “Last year on The Voice, all four coaches were given guidance to prepare them for their new roles on TV, as it was a new format and unfamiliar territory for all.”
Meanwhile, Sir Tom revealed how he only agreed to sign up for a second series when he knew the coaches would remain the same.
He said: “If one coach didn’t return I wouldn’t have even thought about it. When Jessie J and I were doing the Diamond Jubilee, Jessie asked me, ‘Are you going to do the next Voice?’
“I said, ‘I don’t know. Are you?’ She said, ‘I will if you will’. Danny and Will were already in, so I decided right then to return.”