On 15 June 2016, Kolovos signed a long season loan from Olympiakos with Belgian Pro League club KV Mechelen.
[17] On 19 January 2019, in his third appearance with the club was the MVP as he played as a substitute and scored a brace, giving David Ramírez an assist in a 3–1 home win game against Nea Salamis.
[18] On 29 March 2019, Omonia bought the player from Mechelen, by activating the purchase option set by the two teams in December 2018, on a two-and-a-half-year contract for a fee of €120,000.
The Greek midfielder began to get back on track his career with Omonia in the second half of the 2018–19 season, contributing with four goals and one assist in 18 Cypriot First Division matches.
"[20] On 11 September 2020, Kolovos will continue his career with last year's Moldovan National Division champion Sheriff Tiraspol, on a long-season loan from Panathinaikos.
On 28 July 2021, Kolovos will continue his career in Sheriff Tiraspol, this time with a regular transfer, as he was released by mutual consent from Panathinaikos, for a year contract with an undisclosed fee.
[22] On 17 August 2021, Kolovos with a volleyed strike gave Sheriff a dominant lead in a 3-0 home win game against Dinamo Zagreb in the Champions League playoffs 1st round.
[24] On 1 February 2022, Kolovos will continue his career in Kocaelispor, with a regular transfer, as he was released by mutual consent from Sheriff Tiraspol, for a year-and-a-half contract with an undisclosed fee.
On 9 November 2014 Greece head coach Claudio Ranieri announced the first call up of Kolovos (replaced injured Salpingidis) for the match against Faroe Islands.
On 19 March 2019, Greece head coach Angelos Anastasiadis announced the call up of Kolovos for the match against Liechtenstein and Bosnia and Herzegovina for UEFA Euro 2020.
[28] On 26 March 2019, Kolovos heading home powerfully hit goal from a great Zeca right-wing cross in the 85th minute equalizing in a 2–2 finish against Bosnia and Herzegovina against 10-man Bosnia-Herzegovina at the Stadion Bilino Polje in Zenica in their second Euro 2020 qualifying match.