On June 2019 the 26-year-old Greek keeper joined Maccabi on a free transfer from Olympiacos. Gianniotis, joined Olympiacos as a 19-year-old and gained experience on loan at APO Fostiras and PAS Giannina before Olympiacos loaned him out to Panionios. The tall custodian was then voted keeper of the season at 2016/17 while similar success the following season at Atromitos earned him the best keeper award once again this time with another club. Gianniotis, who will wear the number 1 shirt at Maccabi, made 2 international appearances for the Greek national team and has 4 more appearances for his country’s U21 side.