WATFORD DUO SAY GOODBYE
The 32-year-old Yates joined The Hornets from Derby County (pictured) in July 1998 yet, after only making 10 appearances, he sustained a knee injury in October of that year.
The former England Under-21 international was out till April of this year, and following a handful of matches with the reserves, Yates has been forced to retire due to the troubled knee.
Watford manager Graham Taylor said: "In the small number of games Dean has played for us, he showed his capabilities and what a good professional he was.
"It is always sad when a player has to retire and we certainly wish Dean all the best for the future."
Meanwhile, the 18-year-old Johnson leaves the club, having been a product of the Watford Academy but failing to break into the first-team at Vicarage Road.
On Johnson, Taylor said: "Lee did very well and I would compliment him on his commitment.
"However, I saw no real light at the end of the tunnel for him, and I felt it was in the best interests for both parties, if we enabled Lee to find another club."