Marin confident finding place in Chelsea midfield
He has been regarded as a special talent for some time but recognises that he has yet to quite fulfil his potential and believes he is now at the best place to take his game to the next level.
"I hope I didn't reach it (his peak) yet because I am still young and I hope I will improve and show my best at Chelsea," he told Sky Sports News.
"If you play and train every day with players of such quality, then if you want to improve you surely can."
He added: "German football over the last few years has improved and there a lot of good young players in the Bundesliga, so if they perform well other clubs see this."