Manchester United defender Rio Ferdinand is a big fan of Benfica star Axel Witsel.
Ferdinand tweeted his admiration for Witsel during the first-half of England's friendly win over Belgium.
"For me, Witsel will be a top player within a few years," declared Ferdinand.
United and Chelsea have sounded out Benfica about Witsel's situation this year, though Real Madrid are regarded as favourites for the Belgian should they decide to sell.
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