In early 2015, Kouloglou was designated a member of the European Parliament on behalf of Syriza, after Georgios Katrougalos joined the Tsipras cabinet.

[2] On 23 October 2023, he announced his departure from the Syriza parliamentary group amidst a rift with newly elected party leader Stefanos Kasselakis.

On January 28, 2010 as compensation to the " censorship" imposed on him, he returns to the Hellenic Broadcasting Corporation's (ERT) as a member of the Board [4] appointed by the new government.

He has written books on current affairs and politics (Sta ihni tou Tritou Dromou, 1986 (On the footsteps of the "Third Road"), Mia fora ki enan kairo itan mia Sovietiki Enwsi, 1994 (Once upon a time there was a Soviet Union), Oi kokkinoi ksanarhontai, 1994 (The return of the Reds)), historical testimonies (Martyries gia ton Emfylio kai tin Elliniki Aristera, 2005 (Testimonies on the Civil War and the Greek Left)) and Min pas pote monos sto tahydromeio, 2002 (Never go to the post office alone)), top best seller for years 2002-3.

His latest documentary "Escape from Amorgos" (2015) is a story about the exiled politician Giorgos Mylonas and true face of the military dictatorship in Greece.