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But while their domestic efforts have faltered and rumours of departures, financial difficulties and in-house splits have followed, Stade's results in Europe have been nothing short of perfect.
A total of eight wins from eight Challenge Cup matches has seen Michael Cheika's men reach a first continental final since 2005 - a final that Haskell is convinced could go a long way to helping Stade re-establish themselves among Europe's elite.
"There's a lot of uncertainty surrounding Stade at the moment. There's a lot of speculation, a lot of players possibly leaving, but there's nothing better to unify you than playing in a final, especially in Cardiff," said Haskell.
"It's been a really mixed season. If we'd have won all our home games, we could be playing in the top four in the League, but unfortunately that's not the case and we've lacked a bit of discipline.
"But to see out a game against Clermont at home in the semi-final shows that the side's possibly maturing.
"The guys really saw that game out. It meant so much to this club. Stade have wanted to win a European title for a long time. We've now put ourselves in a position to do that."
While Amlin success against Harlequins on May 21 would be a first European trophy for Stade, it would be a second for Haskell.
The 26-year-old picked up a Heineken Cup winners medal with London Wasps in 2007 and freely admits that he was after more of the same when he swapped one capital city for another two summers ago.
And with speculation surrounding his own future in France following Martin Johnson's assertion that he wants his England stars playing domestically after this year's World Cup, Haskell says success in a fortnight's time could have a barring on where he plays his rugby next season.
"I came to this club to win things. I didn't realise that I was coming to a club that was in transition like Wasps were when I left them," added Haskell.
"That's where we found ourselves but now we're playing in a final. I was brought up to play in finals with Wasps. I thrive on that kind of challenge.
"These guys are ready. We have the team to win, but we need composure. That's so important over here.
"Harlequins hold big memories for these guys at Stade having missed out to them in 2009. The only minor concern is that any time we go on an away trip to England, the French complain bitterly about the food! I'm hoping that we'll get some good service when we're over in Wales!
"I've really enjoyed my time here with Stade. I've got a lot of things to consider, but I think winning the Challenge Cup might make a big difference."
