The 23-year old German winger joined the Blues from Werder Bremen and is keen to make an impact at Stamford Bridge now he is familiar with the inner sanctum of the European champions after spending some time there prior to pre-season training.
"I am now here for three weeks and I think I know everybody [who works here] now," Marin said.
"I am happy to start team training now and I feel good. It was the first time we trained together with the ball, we did a lot and it was good intensity.
"The first two days we have only one session a day and then it starts with double sessions."