He was born on the Greek island of Kos and started his career in 2001 at local team Asklipios Ko. In 2004, he moved to Nikea-based club Chalkidona and when Chalkidona merged with Atromitos, he was transferred to the latter. Marinos won the 2008–09 Beta Ethniki championship with Atromitos.
On 24 August 2009, Marinos signed a contract with Panathinaikos as a replacement for Bryce Moon, who was sent away on loan to PAOK the same year. It was agreed that Atromitos would receive a fee of. He joined Panathinaikos a week later, on 31 August, and made his league debut on 13 September 2009 in an away game against Panthrakikos, playing a full 90 minutes. He was a member of the Panathinaikos team that won the double in 2010.
Charleroi
On 14 July 2013 Marinos signed a two years' contact for an undisclosed fee with the Belgian club Charleroi. He made his debut with the club on 17 August 2013 in a 1–2 home loss against Kortrijk and scored his first goal on 29 November 2014 in a 2–3 away win against Westerlo. On 12 August 2015, after a remarkable year with the club, Marinos extended his contract till the summer 2018. He returned to the squad after three months playing as a starter in a 3–2 home loss against Waasland-Beveren. On 21 April 2016, almost at the end of the 2015–16 season, Frédéric Borlée, doctor of the club, summarises the doctoral report:" He suffers from the disease of Haglund. Basically, it has a bony outgrowth at the back of the calcaneus which caused partial rupture of the Achilles tendon. The operation is necessary." Furthermore, "...the Greek midfielder had several injuries in the last few months and his return to the squad should not occur before 4–5 months", the doctor concluded. Marinos will therefore miss the summer preparation as well as the beginning of 2016–17 season. After a very difficult period for the defender marred by injury, on 17 December 2016, he returned to the squad as a starter in a 2–0 home win against Royal Excel Mouscron. On 19 February 2017, in a 1–1 away draw against rivals K.R.C. Genk, he scored his first goal in the season as a substitute, helping his club to climb in the 5th position of the League. He started the 2017–18 season as a starter. On 1 December 2017, in a home game draw against rivals K.V. Oostende reached 100 League appearances with the club's jersey. On 28 March 2018, during an impressive season, Marinos renew his contract with Charleroi for three years for an undisclosed fee.
