La Gazzetta dello Sport says Inter president Steven Zhang and chief exec Giuseppe Marotta have told coach Simone Inzaghi that a star will be sold this summer for financial reasons.
Bastoni, Milan Skriniar or Lautaro Martinez could be sacrificed.
Inter want to sell a key player and United is best placed in the hunt for Bastoni, 23.
New manager Erik ten Hag wants a ball-playing defender with a good passing range and United are investigating the possibility of placing a bid for Bastoni.
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