Valerianos was first included in Olympiacos' first team in a league match against Panthrakikos on 11 April 2010, where he appeared as a second-half substitute.
[5] The 27-year-old left back can be considered as somewhat of a journeyman despite his age as in July 2017, signed with Aris that officially announced his acquisition.
[7] On 4 July 2019, the international back will have an intermediary station in his career after being loaned to Riga, a Latvian football club, which owns the same property status as Pafos.
According to sources the borrowing will take just a month for the international left back in order to help the club for the 2019–20 UEFA Europa League qualifying phase and play-off round.
[9] On 19 March 2019, Greece head coach Angelos Anastasiadis announced the first call up of Valerianos for the match against Liechtenstein and Bosnia and Herzegovina for UEFA Euro 2020.