Belgian Gerets, who took charge in September 2007, said on Wednesday he would not stay at Marseille because of the lack of trust between himself and club owner Robert Louis-Dreyfus.
"For us players, the most important thing right now is to be champions," captain Lorick Cana told Thursday's L'Equipe.
"As the team captain, I feel the players are not too disturbed going into the final sprint."
Although some players were shocked by Gerets's announcement, they would not let their personal feelings interfere.
"We are professionals. We heard it could disturb the team but it is part of our careers," said defender Ronald Zubar.
"If we become champions, it will be thanks to him (Gerets)."
Midfielder Mathieu Valbuena, who became a regular starter under Gerets, said he was "stunned" by the news the Belgian would leave.
LYON'S FEAR
However, he added Marseille would be fully focused on the job in hand, saying: "We will not let go, we will do everything we can to be crowned champions in May. There is nothing to be afraid of."
