Didier Deschamps will use a lesson from his past involving David Beckham to ensure Marseille exploit any weakness in Manchester United's Champions League armoury.
Even from the least promising positions, shocks can occur, as Deschamps experienced himself in 2004 when his Monaco outfit hauled themselves back from a 4-2 first leg deficit to beat Real Madrid on their way to a final defeat by Porto.
"In that first match, David Beckham deliberately got a yellow card so he would be available for the next round if Madrid got through," claimed Deschamps. "But during the second game, my players said that physically, Madrid were not there at all. We still needed a great performance - and we delivered."
United head to the Stade Velodrome as overwhelming favourites to reach the last eight despite being shorn of seven senior players for the first leg clash.
However, Deschamps added: "This match is different because the second leg is at Old Trafford, where the crowd always puts you under pressure but it does give us something to think about."
Gabriel Heinze has done his bit to take the sting out of the occasion by expressing regret for the manner he left United in 2007.
A fans' favourite during his three years at the club - he won the player-of-the-year award in his debut campaign - Heinze departed in bitter acrimony, after trying to force through a move to Liverpool, which United refused to sanction.
The matter was ultimately resolved in the club's favour following the Premier League's intervention, although the saga soured Heinze's relationship with the United supporters, who could not understand how he even thought about joining the Merseyside giants.
"I don't really want to talk about what happened four years ago," he said. "Maybe some day I will tell the whole story.
"But I knew the risks and was aware of what being at a club like Liverpool would mean. I regret it a lot, especially the last three months."