Manchester United are already said to be planning a January transfer spending spree.
The Red Devils have been heavily scouting Valencia midfielder Javi Guerra in recent weeks.
Per Marca, manager Erik ten Hag is a huge admirer of the Valencia and Spanish under-21 midfielder.
United have invested in their midfield this summer, signing Mason Mount and Sofyan Amrabat.
However, Ten Hag is still searching for a pass master in the middle of the park.
Guerra may fit the bill, especially if United sell the likes of Scott McTomimay in the future.