The veteran Barcelona centre-forward, with his contract running down, has been linked with United this past week.
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Club directors - and manager Ruben Amorim - see Lewandowski as an ideal mentor for Benjamin Sesko.
But the Mirror says Ratcliffe has blocked the move, despite the Pole's looming Bosman status.
Ratcliffe doesn't want a repeat of past deals like with Cristiano Ronaldo and Bastian Schweinsteiger - and has told management to drop thoughts of a move for Lewandowski.
