The Tricky Trees have been scouring the transfer market for additions and had been holding talks with Arsenal to land full-back Nuno Tavares.
Now they have switched their attention to La Liga and Spanish giants Sevilla, with Argentine full-back Montiel the object of their affections.
An agreement has been reached with Sevilla, according to Argentine outlet TyC Sports, with an €11m fee thrashed out.
Montiel will travel to England on Monday, where Nottingham Forest will then put him through a medical.
If the defender can pass the checks, he will then put pen to paper to a contract with the Tricky Trees.
Sevilla signed the 26-year-old from Argentine giants River Plate in the summer of 2021, paying €11m for him.
The Spanish giants have had financial issues this summer and selling Montiel will help balance the books.
