Several key players are just one yellow card away from being banned for a possible semi-final first leg, but the boss will still use his best line-up against the French side
The Bavarians have a 2-0 aggregate advantage heading into the second leg, but the trainer will take no risks, citing a warning sign in the French side's comeback from 2-0 down to earn a 3-2 win away to Borussia Dortmund earlier this season.
"Of course we have a psychological advantage from the result of the first leg, but against Dortmund, Marseille proved what they could do in the Champions League," Heynckes told reporters.
"My line-up will not be influenced at all. Also, I think we have very intelligent players in our team who know how to behave on the field."
Toni Kroos, Thomas Muller, Luiz Gustavo and Jerome Boateng all face suspension should they receive a yellow card.