[3] Gontikas began his professional career in 2016, in the Greek Basket League club Panathinaikos.
He made his Greek Basket League debut on 13 November 2016, in an 80–65 win against Kolossos.
On July 31, 2020, Gontikas terminated his contract with Peristeri and signed a one-year deal with AEK Athens.
On March 22, 2022, Gontikas moved to Romanian club U FC Argeș Pitești for the rest of the season.
In a total of 14 league games during the season with both clubs, Gontikas averaged 4.6 points and 2.2 rebounds, playing around 11 minutes per contest.