In July 2016, Gonias was appointed manager of fellow 2nd tier club Kallithea, leading them for 8 games with a 2−0−6 record. After an unrealized deal with Gamma Ethniki side Volos NFC, Gonias was appointed manager of newly promoted Football League club Ergotelis in August 2017.
In July 2016, Gonias took charge as the head coach of Kallithea, managing them over eight games with a 2-0-6 performance. Following an unfulfilled collaboration with Volos NFC from Gamma Ethniki, Gonias became the manager of Ergotelis in August 2017.