Their greatest feat was to come in the 1998 - 99 season when they would win the treble .
It was another pair of Champions League group stage showdowns with Barcelona that would give a glimpse of what was to come .
Their greatest feat was to come in the 1998 - 99 season when they would win the treble , and it was another pair of Champions League group stage showdowns with Barcelona that would give a glimpse of what was to come .