Bath Rugby and NEC Harlequins will take 14 and nine point advantages respectively into the Parker Pen Challenge Cup semi-final second leg matches against Montferrand and Connacht with both ties hanging in the balance.
The two English clubs now face the challenge of traveling away and keeping their noses in front in match points - at best - or at least points difference in their bids to reach the showpiece final at the Madejski Stadium on Saturday, 22 May.
"When you play in France you must play good, solid rugby to win. If we play loosely, then we will lose," John Connolly, the Bath Rugby head coach.
"We've done the hard work in this competition and come through seven games. Now we have to look to come through two more because the fans love to see us win trophies.
"I know from my time at Stade Francais that we can expect a hot reception in Montferrand.
"They should have Pierre Mignoni back to play at scrum half and he will make a difference to them because he's a real strike force.
"They competed very strongly at the break down, which surprised us, and they were very physical and put huge pressure on us behind the scrum through Olivier Magne and the centre pairing of Tony Marsh and Franck Comba.
"I think they will strengthen their front row and could make four or five changes for the return game.
"As for us, I'm hoping to have Mike Tindall, Iain Balshaw, Mike Catt, Danny Grewcock and Simon Danielli back in two weeks time."