That was coach Hugh Campbell's downbeat but realistic prognosis as he named a virtually unchanged team from the one that secured their first cross-border Celtic League victory a week ago.
"The mental aspect of it is huge," he said in today's Scotsman.
"We understand how hard it is going to be," he went on. "But we have to go in there with a very positive attitude. The reality is that we are definitely underdogs. We are going to have to play our best rugby of the season to deserve to win this game." And he made it clear that that meant playing better than they had against Ulster. "No question about that.
"This year is not about setting targets for winning the European Cup or even getting to the next round of the European Cup. Let's see what we can do, let's see where we are, what we can get out of this competition, see what are the benefits we can take from playing against teams like Northampton and Toulouse in one of the top competitions."
"We have to be absolutely right mentally going into this game," said Hugh. "We have to go in there giving them no respect; we have to play our game and not stand back."
If Glasgow can get any decent possession, all eyes will be on stand-off Dan Parks, who set a Glasgow record last week in racking up 24 points. Campbell agreed that international experience over the summer had helped make Parks a more complete player. "He has also developed physically and he is better placed to play a more comprehensive game."
Kenny Logan, one of Glasgow's key signings over the summer and a rare Scottish player with experience of being on the winning side in a European Cup final, said. "We can definitely do it, but it won't be easy."
Kenny reckoned that there might be benefits attacking between 10 and 12, as Parks and Andy Henderson, his inside centre, did successfully last week. "Shane Drahm (brought back from an experimental run at full-back for Northampton to his more familiar role at fly-half) is not the greatest tackler in the world," he said.