Michael made his professional debut against Abed Halaby in November 2013. He won the fight by a third-round knockout. He won his next four fights, before challenging Panagiotis Zissimopoulos for the WKU European title. Michael won the title by knockout. Michael would go on to win 20 of his next 21 fights, during which he won the
ISKA European Lightweight Muay thai and
WMC World Lightweight titles. While his previous fights were mostly in the Greek muay thai circuit, after winning the WMC title, Michael began fighting almost exclusively in
Thailand. He scored decision wins against Phetsongkom Sitjaroensub and Kaensuan Sasiprapa, as well as a KO win against Jomrachan Kiatworatha in the Rangsit Stadium. Michael participated in the 2018 Toyota Revo Marathon 135 lbs Tournament. He defeated Kongsuiya Sitnatee by decision in the quarterfinals, and Vladimir Lytkin by head kick in the finals, before facing Felipe Lobo in the finals. He beat Lobo by decision. Michael entered the 2018 Toyota Revo Marathon 140 lbs Tournament as well. He beat Antonio Faria by decision in the semifinals, and
Julio Lobo by decision in the finals. He made his
ONE Championship debut against
Singtongnoi Por.Telakun at
ONE Championship: Warriors Of Light, winning the fight by unanimous decision. He next knocked out Petngam Kiatkampon at the
Rajadamnern Stadium, before returning to ONE to face
Lerdsila Chumpairtour at
ONE Championship: Dreams of Gold. Lerdsila won the fight by a second-round TKO. In December 2019, Michael fought Dennanpho Sor Thanyaluk for the
WBC Muaythai World Lightweight title. Savvas won the fight by a fourth-round TKO. After his title win, Michael returned to ONE at
ONE Championship: Warrior's Code against
Taiki Naito. Naito won the fight by unanimous decision. Michael faced the former Omnoi stadium champion Amir Naseri at
ONE 157 on May 20, 2022, in the
ONE Muay Thai Flyweight Grand Prix Quarter Final. He won the fight by unanimous decision. Michael faced
Panpayak Jitmuangnon in the quarterfinals of the
ONE Muay Thai Flyweight Grand Prix at
ONE on Prime Video 1 on August 27, 2022. He lost after getting knocked out with a head kick in the second round. Due to a disagreement between his gym,
Petchyindee Academy, and
ONE Championship, all Petchyindee fighters were released from the promotion at the request of the gym. == Championships and awards ==