Manchester City completed their own treble this season, but it didn’t come close to surpassing the achievement of their rivals 20 years ago.
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Manchester United, Sir Alex Ferguson and the 1999 Treble: That night in Barcelona - Eurosport
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Manchester United, Sir Alex Ferguson and the 1999 Treble: That night in Barcelona - Eurosport
The 1999 Treble: Five games that helped Man Utd win Premier League, FA Cup & Champions League - BBC Sport