Kevin Pietersen has hit back at John Buchanan after it was suggested he could be a potential weak link for England in the Ashes.
Buchanan, who had a six-year stint as coach of Australia, proclaimed the South African-born right-hander could become "a major problem" for the tourists during the winter, if he continued to struggle in Test cricket.
However Pietersen insists he is not interested in what the 57-year-old has had to say, describing him as "a nobody".
"I didn't react to it (Buchanan's comments) because it was strange that he made headlines," he said.
"I'm not interested in what he has to say. Who is he? He's a nobody.
"He had the best team to coach in the history of cricket. Anyone could have coached that team. He has done nothing else solid so I won't even take it with a pinch of salt."
Pietersen was not so critical of another coach in Graham Ford, who nurtured the player as a youngster during his early years back in South Africa.
The pair worked together again during the 30-year-old's recent spell at Kawazulu Natal Dolphins. Although he only managed scores of 38 and a second-ball duck during his stint, Pietersen insists it was a worthwhile trip.
"Graham Ford was brilliant for my confidence. He knows how to get the best out of me," he said.
"I did some amazing work with him and absolutely loved it. I re-kindled some shots out of my old style of play. I'm really looking forward to the series and I'll be full of confidence that I'll do well.
"I am going to go out there and get some runs.
"I'd love to post a big score in the first Test. I've done it before so why not again? I love playing Australia."
England will be looking for better fortunes than on their last tour Down Under, when a side led by Andrew Flintoff were whitewashed 5-0.
Pietersen is convinced that the squad are in a better position this time around thanks to a sense of unity that has been instilled in the team since Andy Flower's appointment as team director.
"Last time it was horrendous," Pietersen conceded.
"There were a lot of individuals who turned up in Australia last time, we were humbled and humiliated by an incredible team and that made a big difference.
"(But) we have more of a team now than we did in 2006-07.
"I think we can win the series. We are better prepared, physically and mentally."