Ospreys coach Steve Tandy refused to use the ongoing uncertainty over the future of the Welsh regions as an excuse for Sunday's loss.
Talks between the Welsh Rugby Union and Regional Rugby Wales, who represent the four regions, are yet to show any sign of resolution.
"It is not a great situation. It doesn't get resolved, it is always getting put back, but it is a side issue, it is not an excuse for us," said Tandy.
The Ospreys slipped to their fourth loss in five matches in Pool 1 of this year's Heineken Cup, leaving them bottom of their group and underlining the gap in quality between themselves and Leinster and Northampton at the top.
Tandy bemoaned a number of missed opportunities over the course of the competition for having damaging effects on his team's fortunes.
"When we go back over the Heineken campaign, we know in this tournament that if you don't take your opportunities then there are massive shifts in games," added Tandy.
"The endeavour and effort was there right across the board.
"There is a lot of good in our game, but just little pointers where we take our foot off the gas.
"We looked half-decent at times when we had the ball, but in these environments and these games if you switch off for a second, it's curtains."