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 was appointed as the head coach of Kallithea, leading them through eight games with a record of two wins and six losses. Following an unfulfilled agreement with Volos NFC from Gamma Ethniki, Gonias took over as the manager of Ergotelis in August 2017.