Manchester United boss Erik ten Hag is eager to strengthen his spine this season.
United have already made a failed £35m offer for Everton centre-half Jarrad Branthwaite.
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And as negotiations continue this week, the Athletic says Ten Hag also wants a midfield signing and a new centre-forward.
The Dutchman is counting on senior additions, with good experience.
United are releasing striker Anthony Martial this summer, while midfielder Casemiro could also be on the move.