The Portugal defender, 25, is regarded by many as one of the finest fullbacks in Europe, with a host of clubs across the continent said to be willing to sign him this summer.
And although Benfica claim to have the player under contract until the summer of 2008, reports indicate this deal is invalid as the actual deal is missing a signature.
This has alerted Arsenal, Liverpool, Manchester United and Newcastle United, as well as La Liga hopefuls Valencia and Italian champions Juventus – all of whom are keen on Miguel.
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