Robson is in search of a full-back, and was keen to land the right back this summer, but the asking price for Miguel has been hugely increased following his success in this summer's European Championships.
Speaking about the matter, Robson said:
"Miguel has been a sensation. I knew he was a good player before the tournament and tipped off my chairman about him.
"Unfortunately Benfica want double their money after his performances here."
Another target of Robson's is believed to be Spurs' Stephen Carr, but do we really want him?
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