Watford's technical director Gian Luca Nani has resigned after admitting he has been considering his position for some time.
"It's a decision I've had in my mind for some time now," Nani told the club website.
"I feel it is the right time for me to leave the club and I'm looking now for new challenges elsewhere.
"But I was asked to ensure everything was complete in terms of the squad and the transfer market towards the end of August. This is something I was very, very happy to do."
He added: "I believe the squad is now competitive and together we have done a great job to achieve this.
"I'm really proud to have served this wonderful club and made some fantastic progress, working with the Pozzo family - who I have known for around 20 years - and my good friend Scott Duxbury.
"I would like to thank everybody connected with the club; both the staff and the supporters for the help that they have given me always.
"I have shared in some very special moments during my time with this club. Watford will always be in my heart and I know I will be continuing to have a great relationship with the club.
"The day of the Play-Off semi-final is one that everyone remembers. This is the single moment during which I have experienced the greatest emotion working in football."
Hornets' CEO Scott Duxbury added: "We have very reluctantly accepted Gian Luca's decision.
"I fully respect his choice and it is a matter of fact that his contribution to Watford Football Club cannot in any way be underestimated.
"He will continue to be held in very high regard by the club, and, as well as being a good friend, was an accomplished technical director.
"We part on extremely amicable terms and I know that all those who hold the club in high regard will join me in wishing Gian Luca every success in the future."