In October 2014, Atmatsidis has been in the technical department of the infrastructure departments of AEK until 2019, when he was for a short period an assistant manager to Nikos Kostenoglou.
From October 2014 to 2019, Atmatsidis was associated with the technical department of AEK's infrastructure divisions. He served as an assistant manager to Nikos Kostenoglou for a short period during this time.