United are keen on the Cameroon international as they seek to strengthen manager Ruben Amorim's midfield options.
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However, ESPN says Brighton are reluctant to do business and have slapped a €120m price-tag on Baleba's shoulders.
At United, Baleba would join Cameroon teammates Andre Onana and Bryan Mbeumo.
Baleba has three years remaining on his contract with an option to extend for a further 12 months. It's been suggested he won't agitate for a move away should United firm up their interest in the coming days.
