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値下げ交渉 1998-99-00 トレブル マンチェスターユナイテッド UMBRO/アンブロ 検)98 1999 2000 MANCHESTER UNITED TREBLE BECKHAM ベッカム - サッカー、フットサル

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1998–99 FA Premier League - Wikipedia

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Manchester United Treble Champions Watch

1998–99 Manchester United F.C. season - Wikipedia

Re-Living Manchester United's 1998/99 Champions League Run

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What is the definition of a 'treble'? Is winning two major trophies (Leagues, Champions League, etc.) equivalent to winning a 'treble'? Or should there be an asterisk next to such a victory