Marseille coach Albert Emon is aiming to mentally boost his side as they continue their push for a place in the UEFA Champions League.
L'OM have notched up just two points from their last four Ligue 1 matches and sit in fifth position in the table.
Emon is looking to take an all important three points from Saturday's game at Toulouse in a bid to make qualification for the European tournament.
"We have completed a review of everything. We have four big matches (Toulouse, Lens, Lyon and Nice) to play to remain in the running for the Champions League," he said.
"We are working fine without pressure, but as we did before the Nantes and Bordeaux games I will change our state of mind so we show more courage, strength and fighting spirit.
"Mentally we have to be unquestionable and show trust in our means. We are waiting for more involvement from the players.
"We have to be killers, a striker must be a killer as should the ones that assist. I don't believe we have lots of killers in this team, except Djibril Cisse when he is fit."