Lennon was in London for over a decade with Tottenham Hotspur before moving to Everton back in 2015.
However, the wide man only managed to make six appearances for the Toffees, and with so many new faces going into the club, he might be looking to get game time elsewhere.
Hornets have expressed interest
The former England international could be an ideal candidate for Marco Silva, who has openly expressed his interest in bringing a winger into the club this summer.
Watford let Steven Berghuis leave for Dutch club Feyenoord earlier this week, and with the season edging closer, the Portuguese boss will be looking to sort this matter out sooner rather than later.
Silva is wanting to bring Lennon to Vicarage Road on a permanent deal, but the player and Watford owner would prefer a loan move for the 2017-18 season.
As for Everton, they’re looking for Lennon to move out on a permanent deal, and that is something that the Hornets will have to consider if they’re keen on bringing him to the club.
Silva wants more English players at club
Silva spoke at a press conference last week and claimed that he wanted to bring more English players through the doors at Vicarage Road.
Captain and striker Troy Deeney and midfielder Tom Cleverley were the only two Englishmen to enjoy frequent first team football under previous head coach Walter Mazzarri.
The Italian parted ways with the Hornets in the summer, making way for former Hull City head coach, Silva, to take over the helm.