In 1999, Ferguson and Manchester United completed an unprecedented treble, winning the Premier League, FA Cup and Champions League.
Ole Gunnar Solskjaer's goal at the Nou Camp, deep into injury time, handed United a famous 2-1 victory over Bayern Munich.
They had earlier beaten Arsenal to the league title by a single point, and defeated Newcastle 2-0 in the FA Cup Final.
Ferguson was knighted for services to football in June of that year, and United extended their success into the new millennium, winning back-to-back championships in 2000 and 2001.
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