Chelsea's "better players" will expose Bayern Munich's "weak" defence in Saturday's Champions League final, says new Blues signing Marko Marin.
The Germany midfielder, who will move from Werder Bremen in the summer, says Bayern are vulnerable at the back.
Asked if Bayern's defence was weak he told BBC Sport: "Yes. I watched the German cup final [5-2 loss to Borussia Dortmund]. They made big errors.
"Chelsea have better players and will do well if they play offensively."
The 23-year-old 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."
The four-time European champions were humiliated 5-2 by Borussia Dortmund, to whom they also finished a distant second to in the league.
However, Marin picked out two major threats he believes Chelsea will have to pay particular attention to.
"I think the strongest Bayern player is Franck Ribery because of his dribbling and because he's a goal threat," said Marin, who will join the Blues from Werder Bremen this summer for a fee reported to be about £6m.
"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.
Meanwhile, Marin said he was surprised that Chelsea finished as low as sixth in the league.
"This club has to play in the Champions League," added the former Borussia Monchengladbach star.
"Everybody is a bit surprised as to why they didn't play as well as they can [during the season]. Towards the end of the campaign they were better and reaching the Champions League final was a very good thing."