Monaco have confirmed the signing of striker Guido Carrillo from Argentinian club Estudiantes.
Exeter have signed defender Troy Brown following his release by Cheltenham.
The Colombia international, who is reportedly a target for Manchester United and Barcelona, was left out of Fiorentina's squad in Sunday's 2-1 friendly triumph over Real Madrid in Warsaw, increasing speculation about his future.
However, Montella believes that, despite the 26-year-old being strongly linked with a move away from Florence since May, he will stay put.
"I have never thought of losing Juan," Montella told La Nazione. "He's been here in the past, he is here now and he will be here in the future.
"I don't think about how his (Cuadrado's) story might finish.
"A player like him can play in every position in midfield."
Cuadrado scored 15 goals in 43 appearances in all competitions for Fiorentina last season and is under contract at the Stadio Artemio Franchi until June 2017.