Delta Work won the Pertemps in a thrilling photo finish from Glenloe at Cheltenham on Thursday. Both are Gordon Elliot trained horses.
Davy Russell was on board the winner with Barry Geraghty riding the favourite Glenloe.
Speaking on ITV's Cheltenham coverage, broadcast by TV3 in Ireland, Matt Chapman was critical of how Barry Geraghty rode Glenloe.
"What a terrific finish. Another for Gigginstown but come on, AP and Luke, every punter watching that race will have said, 'If Barry Geraghty didn't sit like he did, he would have won," Matt Chapman said shortly after the race.
"It's all very well sitting like that if you don't make a mistake at the last but the only thing that beat Glenloe there was the mistake at the final hurdle. Without that mistake, he would - categorically, no doubt - have won."
Former jockey Luke Harvey, working as an analyst on ITV, dismissed Chapman's analysis.
"Well, it's a game of opinions and that'd absolute drivel because I promise you, going down to the last, horses make mistakes like that.
"You're flat out in one of the most competitive races of the season. I fail to see what he could have done any differently."
Neither did Tony McCoy accept the criticism of his fellow jockey.
When you get beat, you're always wrong and when you get beat, you'd always love another go - that's the way it is. Would Barry love another go? Yeah he would. But did he do anything wrong? Of course he didn't.
Barry Geraghty has had a lot more winners than the clown that just asked the question.
There has been a bit of some bubbling animosity from McCoy towards Chapman throughout the three days at Prestbury Park. Chapman has continued to rile the 19-time champion jockey.
You can watch the moment below.