Watford boss Quique Sanchez Flores has told the club's official website that he has fond memories of Leeds United after their run to the Champions League semi-finals in 2001.
After finishing in third place in the Premier League during the 1999-2000 campaign, Leeds secured qualification for European football's premier competition for the first time in eight years.
The Lilywhites played group fixtures against Barcelona and Real Madrid and defeated Deportivo La Coruna in the quarter-finals before losing 3-0 on aggregate to Valencia in the last four.
Despite missing out on a surprise place in the final, Flores has been full of praise for Leeds and suggests that the history of the club will ensure that they are always recognised as a big club in English football.
Flores said: "When I was working in the media after I retired as a player, I saw Leeds play in the Champions League Semi-Final against Valencia and I remember perfectly how important this team was in this period. They were close to playing a final in the Champions League.
"Football is football, it is very difficult to know what will happen in the future. They had a bad run and now they aren't in the Premier League, but we respect a lot the history of this team."
The two teams head into their FA Cup fifth round clash on Saturday afternoon in contrasting form, with Watford having accrued seven points from their last four Premier League fixtures and Leeds travelling to Vicarage Road on the back of just one win in nine outings in the Championship.