[5] In 2019, he joined Panionios, making his debut in the Super League Greece on 25 August 2019, in a match against Volos that ended in a 2–1 loss.
[6] His debut top-tier season included 15 appearances and a single goal across league and cup competitions.
[8] Subsequently, in July 2021, Levadiakos signed him on a two-year deal, and together they secured the Super League 2 championship at the culmination of the 2021–22 season.
[9][10] On 3 August 2023, Doumtsios signed a one-year contract with an option for an additional year with Dutch Eerste Divisie club TOP Oss.
[2] His performances earned him a move to VVV-Venlo on 26 June 2024, where he signed a two-year contract with an option for an additional season.