The Mexicans only need a point in Recife on Monday to book their place in the knockout stages.
Marquez, playing in his fourth World Cup, has been pleased at how his team have played so far and is urging them not to let the effort they have put in go to waste.
"This is our biggest game. We know we have to keep the momentum going," he is quoted as saying by the Daily Star.
"We worked so hard in our last two games and we don't want to throw it all away against Croatia.
"They are a great team, so it won't be easy. We will have to give our best to get at least a point and move on to the next phase."
Marquez has scored 15 goals in his 122 appearances for Mexico.