Channel 4 has thanked John McCririck for his years of racing broadcasting, but confirmed it will "vigorously" fight the claim he was dropped because of his age.
A statement was released ahead of the tribunal opening in central London.
We are grateful to John McCririck for his contribution towards Channel 4 Racing over many years.
However we reject the suggestion that discrimination on the basis of age played any part in the decision not to include John in the Channel 4 Racing team from 2013 and we are vigorously defending this claim.
Racing pundit John McCririck was dumped by Channel 4 because he was "alienating" and "offensive", an employment tribunal heard.
On the first day of his employment tribunal, racing pundit John McCririck insisted he was a victim of age discrimination and is not sexist.