Watford have reportedly rejected an offer worth around £30m from Everton for Abdoulaye Doucoure.
The 25-year-old had an impressive season at Vicarage Road last time out, scoring seven goals and picking up four assists in 37 Premier League games.
Doucoure is believed to have been a target for several leading Premier League clubs, such as Manchester United, over the course of the season.
According to French publication RMC Sports, the Toffees have offered Watford an initial £25m with an additional £5m in add-ons for Doucoure, but the bid was turned down.
Doucoure has been on Watford's books since his move from Rennes in February 2016.