Siovas began the 2019–20 season as the de facto leader of the Leganés defence. On 1 December 2019, Siovas suffers a severe bruise with hyperextensin in his left knee in the 5th minute of an away La Liga game against Sevilla FC. The 32-year-old Greek defender leaves Leganes after 3,5 seasons, in which he has played 108 official matches, scoring four goals. He is the third foreign player to exceed one hundred official matches with Leganes, after Martin Mantovani and Gabriel Pires.