Marin made just 16 appearances for Chelsea in his debut season and had not featured for the club in three years.
Manchester City manager Pep Guardiola admitted that goalkeeper Joe Hart is being considered to play against Steaua Bucharest.
As Claudio Bravo arrives in Manchester, Pep Guardiola admits being close to discuss the deal to bring the goalkeeper to the Etihad.
Aguero has started the season in blistering fashion, scoring six goals in City's first three games.
ESPN FC's Alejandro Moreno and Mark Donaldson address the day's rumour mill.
ESPN FC's Alejandro Moreno shares a laugh at the thought of John Terry returning to the England fold.