"The apparent victory of Syriza sends a very clear signal: the austerity policy is inefficient and causes the society great pain," Iglesias told television channel La Sexta.
According to the Podemos leader, Syriza's victory means that Greek people finally have hope that their interests will be taken into account.
Iglesias has previously taken part in a Syriza meeting in Greece, showing his support for and solidarity with the Greek party.
Syriza is leading the polls with 36.34 percent of the vote. It is expected to win 149 seats, falling two short of a parliamentary majority. Some people expect the party to raise the issue of Greece leaving the eurozone after its victory.
First we take Athens, then we take Madrid @Pablo_Iglesias_ #syriza #ekloges2015 #ChangeEurope #Podemos @europeanleft pic.twitter.com/ZQ413PwDQn
— a.tsipras (@atsipras) 22 января 2015
"Grecia tendrá un presidente que asumirá las responsabilidades de su país sin traicionar al pueblo" @Pablo_Iglesias_ #PodemosALaGriegaM4
— PODEMOS (@ahorapodemos) 26 января 2015
"Greece will have a president who will assume the responsibilities of his country without betraying the people", the Podemos' Twitter post read.