Fourth-place Lille had the best chances -- forward Matt Moussilou struck the post from close range in the 59th minute, and Geoffrey Dernis hit a free kick onto the crossbar in the 67th.
Marseille dominated possession, but Toulouse launched a counterattack in the third minute of stoppage time that required Barthez to block Bryan Bergougnoux's shot.
David Nielsen's 48th-minute header saw Danish club Midtjylland beat Valerenga 1-0 and qualify for the quarterfinals.
With the last round being played Wednesday, Midtjylland has 11 points, three more than Hammarby of Stockholm, which beat Norway's Start 4-0, in Group 1. Valerenga has five points and Start two.
Petter Andersson, David Johansson, Bjorn Runstrom and Jeffrey Aubynn scored for Hammarby in Sodertalje, outside Stockholm.
In Group 2, Lillestrom of Norway qualified for the quarterfinals after Canadian striker Olivier Occean's 88th-minute goal in a 1-1 draw at FC Copenhagen.
Sweden midfielder Anders Linderoth scored for Copenhagen in the 24th minute. Danish team Brondby beat Kalmar of Sweden 2-0 on goals from Morten Rasmussen (34th) and Stefan Schmidt (93rd).
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