Irish group The Conway Sisters have said that they are feeling confused about their performances in the 'X Factor' after harsh words from their mentor Simon Cowell.

The sisters from Sligo have come in for criticism from judge Cowell in recent weeks, despite the fact that they are one of his own acts.

"On Saturday we were very confused because Simon criticised us and we feel a little bit hard done by," Sinéad said in an interview posted on the show's website. "We've worked so hard on the songs we've been given."

Cowell claimed that the group sang off key last Saturday night, when they performed 'One Voice'.

"Listening back we definitely didn't fall off key as Simon had said. We just don't understand it," Sinéad said.

"We've been really happy with our performances. We've being giving 100 per cent each week. All we can do is hope that the public can decide for themselves," she said.