Marin has backed them to beat Bayern Munich in the Champions League final.
Asked if Bayern's defence was weak, he told BBC Sport: "Yes. I watched the German cup final. They made big errors.
"Chelsea have better players and will do well if they play offensively."
Marin added: "I think (Chelsea) will win at the weekend.
"Bayern did a very good job against Real Madrid in the Champions League semi-final, but they did not do well in the cup final."