The France international has been a fringe player for the Blues in the Premier League with Nicolas Jackson preferred to lead the attack.

Nkunku can also operate from other attacking positions, but manager Enzo Maresca has been reluctant to start him in the league games.

The former RB Leipzig man is frustrated with his situation and he could hand an ultimatum to the Blues ahead of the New Year.

Nkunku is prepared to push for a new challenge elsewhere if his playing time does not improve in the Premier League going forward.

United are closely monitoring his situation at the moment, but the final decision over an approach could depend on new manager Ruben Amorim .

The Red Devils are more likely to propose a short-term loan deal with a conditional obligation to buy during next summer's transfer window .

Chelsea could look to recoup the £52m fee paid to sign Nkunku.

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