Wondering which was the worst team to have won the Champions League. It's one of Marseille 1993, Liverpool 2005 and Chelsea 2012.To answer that question, we should first define what is good and what is less good. Obviously, on this blog our measure will be the average Goalimpact of the team. However, because we don't really know which players were available in the games, we take the average of the starting XI only. Also we need to define what we mean by 'Champions League'. We included predecessor, the European Champion Clubs' Cup
— Rob Brown (@robbro7) 11. Januar 2015
Before we answer Rob's question, let's look at the best finalists rather than worst finalists.
As we can see, the answer to the opposite of Rob's question is "Manchester United 2008/2009". That is the best finalist not to win the cup. The second best team not to win is Chelsea FC that lost against ManU in a penalty shoot-out. In Goalimpact terms, the teams' ratings were to close to call a winner, too.
Now, let's look at the other end of that table.
|109||1977/1978||Club Brugge KV||103.2||113.7||no|
That answers the question. The worst team ever to win the cup was the FC Porto in season 86/87. But that was in the European Champion Clubs' Cup in which winning for a less good team was more likely. If we restrict the list to Champions League only, we end up with
And hence, according to Goalimpact at least, the worst team ever to win the Champions League was FC Porto in 2003/2004. They were lucky to play against on of the other ten weakest finalists in the competition AS Monaco. Clearly, those times the concentration of top players on a small number of clubs wasn't that advanced already as it is in Europe today. Therefore, there was still a chance that too underdogs could reach the final. This seems unthinkable today.