Ruud Gullit believes Barcelona will have to win and retain the Champions League before they can be regarded as the best side in history.
The Dutchman, who was part of the AC Milan team that secured back-to-back European crowns in 1989 and 1990, appreciates the talent the Catalans hold but feels Tito Vilanova's side must equal the feat achieved by the Italian giants 22 years ago.GOAL.COM - Global football news, transfer rumours and betting editorial
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