The 25-year-old wide player made the move to Stamford Bridge in 2012 when he was signed from Werder Bremen in an 11.5million move.Marin has since gone on to make just six Premier League appearances for the Blues and has been out on loan to La Liga side Sevilla since last summer.The former German international has impressed with the Andalusians who are said to be lining up a permanent transfer of the player.However, Marin could be set for a return to Borussia Monchengladbach whom he played for before signing for Werder Bremen, according to Estadio Deportivo.Marin endured a tough start to life in Seville after a number of injuries hampered his progression but has sprung to form since the turn of the year, helping his side win the Europa League earlier this month.The player’s fate remains in Chelsea’s hands who are not yet sure as to whether they will loan him out for another season for a small fee or sell him outright.