The 46-year-old has been in charge of BVB ever since leaving Mainz in 2008 and has since guided Dortmund to two Bundesliga titles and one DFB-Pokal, achievements that have earned Watzke's complete confidence.
|20/1||Borussia Dortmund are 20/1 with BetVictor to win the Champions League
The Dortmund director added that he remains confident Klopp will not decide to leave the club before the end of his current deal.
"Jurgen Klopp does not sign a contract and then breach it. He has never done something like that. He has a contract until 2016 and will fulfil it."
Watzke also admitted that it is inevitable BVB will occasionally lose players to other clubs due to their refusal to pay similar wages to Real Madrid and Bayern Munich.
"Players leaving Dortmund is partially related to the club's status. How many clubs are there really where no player leaves for a bigger club?
"In order to be able to keep all your players, you will have to pay wages similar to Bayern and Real Madrid."