Manchester United have identified a cheaper alternative to Kalidou Koulibaly.

The club have baulked at Napoli's £150m valuation of the Senegalese defender.

But they haven't wasted any time sourcing another target, according to the Daily Star.

Benfica centre-back Ruben Dias is the man now being eyed by Ole Gunnar Solskjaer.

22-year-old Dias is six years younger than Koulibaly and would only cost the club a fee of £52m, which is included in his current contract.

Benfica have been trying to increase that clause to £87m, but United are hopeful they can swoop in before the changes are made.

Dias already has nine caps for Portugal.