A couple of weeks later I went to the return leg at Tannadice. Sadly, the Swedes triumphed 2-1 on aggregate, and the only consolation for United was a fair play award to recognise their fans' outstanding behaviour.
I took my camera to both games, and documented the supporters in Gothenburg. A few of them have been used in a new TV documentary, as BBC Alba have commissioned a film about Dundee United's exploits in 1987. Entitled Tannadice 87, it will be broadcast on 20 May at 9pm, and on iPlayer after that.
In advance of that, here are some of my photos, which have never been published before. I hope they bring back happy memories of a lost generation of Scottish football - a time when a small provincial club could beat Barcelona home and away, and dare to believe they could be European champions.
All photos are copyright - no copying please!