The 24-year-old winger is open to a move to a Premier League side this summer after Watford were relegated to the Championship last season again.
He has four years left on his contract and the Hornets want a considerable fee before agreeing to move him on.
Everton are amongst the clubs who have been linked with a move for Dennis in the ongoing transfer window.
Frank Lampard is in the market for attackers but it has been claimed that Dennis is not a player Everton want.
The Toffees are considering a number of targets after losing Richarlison to Tottenham Hotspur this summer.
However, they are not interested in pushing forward with a move to sign the Watford player ahead of next season.
Dennis has suitors in the Premier League as well but Everton are not the club he is likely to join this summer.
Everton have other targets in mind such as Chelsea striker Armando Broja, who is also wanted at West Ham.
