Watford have signed winger Nikoloz Chikovani and right-back Jeremy Petris for uindisclosed fees, and centre-back Formose Mendy on a season-long loan.
Frenchman Petris has signed a four-year deal with the club after his exit from Belgian side Royal Charleroi.
The 27-year-old played in Italy and Bulgaria before joining Charleroi in January 2024.
Assistant to the sporting director Valon Behrami told the club website: "He is an offensive wing-back that is pacy and likes to make runs from deep.
"He has the ability to make a difference, especially going forward where he will be a useful player to have in one-v-ones and crosses.