Portugal under-21 international Jota is reunited with coach Nuno Espirito Santo, for whom he played on loan at Porto last season.
Fiorentina have completed the signing of Jordan Veretout from Aston Villa, with the French midfielder signing a four-year contract on Tuesday.
Aston Villa have lifted what is surely the weirdest piece of preseason silverware so far this summer.
Middlesbrough have signed Republic of Ireland goalkeeper Darren Randolph on a four-year deal.
Middlesbrough midfielder Cristhian Stuani has joined La Liga club Girona for an undisclosed fee.
Nottingham Forest have announced the signing of striker Daryl Murphy from Newcastle for an undisclosed fee.