With the European final in Munich edging closer, the new signing is backing Roberto Di Matteo's side to beat Bayern and lift the coveted trophy for the first time
The 23-year-old will move to Stamford Bridge at the end of the season after the Blues agreed an undisclosed fee to sign the midfielder from Werder Bremen.
And the Chelsea new boy believes his future team-mates will expose Bayern's defence at the Allianz Arena on Saturday, as long as they take an attacking approach.
"I think [Chelsea] will win at the weekend," Marin told BBC Sport. "Bayern did a very good job against Real Madrid in the Champions League semi-final, but they did not do well in the [German] cup final.
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"They made big errors [in the German cup final]. Chelsea have better players and will do well if they play offensively."
But the playmaker also warned that Chelsea should be wary of Bayern's attacking prowess and aim to stifle the threat posed by the German side’s stars.
"I think the strongest Bayern player is Franck Ribery because of his dribbling and because he's a goal threat," Marin added.
"There's also Mario Gomez. He's scored a lot of goals in the Champions League and is a constant danger. If Chelsea can stop them then they will do well."