United set for £78m triple swoop.
This would complete a superb double raid on the Saints by United this summer, with the Red Devils also snapping up French midfielder Morgan Schneiderlin ahead of rivals Arsenal for £28m in pre-season.
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Man United transfer news
United also poached one of Southampton’s best talents last year as well, bringing in left-back Luke Shaw for a deal worth roughly £30m.
In total, a move for Mane would make it £78m spent by United on players from the St Mary’s Stadium, with the South Coast outfit picking up an unwanted reputation for being a selling club after various other departures in recent times.