Manchester United agreed to a £50 million deal with Chelsea for Brazilian midfielder Andrey Santos.
The transfer includes a £48 million initial fee and £2 million in performance-related add-ons.
The 22-year-old player has agreed to personal terms and will undergo a medical examination shortly.
This signing addresses a priority need in central midfield following the departure of Casemiro.
The move also provides cover for Manuel Ugarte, who is currently sidelined with a long-term injury.