However , they then endured the disappointment of being beaten to the league title by rivals Leeds United , having led the league for much of the season .
They also added the European Super Cup to the trophy cabinet with victory over Red Star Belgrade at Old Trafford .
They then endured the disappointment of being beaten to the league title by rivals Leeds United , having led the league for much of the season .
They also added the European Super Cup to the trophy cabinet with victory over Red Star Belgrade at Old Trafford .