Leeds' former assistant manager Nigel Gibbs is taking legal advice after quitting the club's coaching staff.
Gibbs, 48, assistant to former manager Brian McDermott who left Elland Road at the end of May, is considering legal action for breach of contract and constructive dismissal.
He had failed to reach an agreement with club owner Massimo Cellino over the severing of his contract.
Gibbs said in a statement released to the Yorkshire Evening Post: "I have terminated my employment with Leeds United in response to the way I have been treated by the club, which amounts to a breach of contract.
"I have put the matter in the hands of my legal advisors and in those circumstances it is inappropriate for me to make any further comment."
Cellino wanted Gibbs to work alongside first-team coach David Hockaday and his assistant Junior Lewis.
Gibbs worked with Hockaday under former Watford boss Aidy Boothroyd before departing Vicarage Road in 2005.