Marin has also been linked with Manchester United, Barcelona and Bayern Munich.
The youngster impressed for Werder Bremen against Tottenham in the Champions League on Tuesday.
Marin joined Werder Bremen in a €8million deal just last summer.
Marin has also been linked with Manchester United, Barcelona and Bayern Munich.
The youngster impressed for Werder Bremen against Tottenham in the Champions League on Tuesday.
Marin joined Werder Bremen in a €8million deal just last summer.
