Derry put in valiant performance but were defeated 1-2 in the home tie.
That Benfica squad included the likes of Aldair, Valdo, Mats Magnusson and Jonas Thern. They went on to reach the final of the competition that season.
The Lisbon giants were defeated 1-0 by an incredible AC Milan team that has been put forward as a candidate for the greatest club side of all time.
Here is a selection of photographs of the occasion from September 1989.

17. Team captains Felix Healy and António Veloso with the match officials.
Team captains Felix Healy and António Veloso with the match officials. Photo: archive

18. Benfica training at the Brandywell.
Benfica training at the Brandywell. Photo: archive
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