[4] On November 24, 2017, Kavvadas signed with the Greek team AEK Athens for the rest of the 2017–18 season, with an option for renewal for another year.
On July 31, 2021, Kavvadas signed a two-year (1+1) deal with Greek Basket League champions Panathinaikos.
His season highlight was a 17 points & 6 rebounds performance at home court against Crvena zvezda on February 25, 2022.
In 2012, Kavvadas was invited to train with the Greece men's national basketball team, for the first time.
He played with the Greece men's national team at the EuroBasket 2013 and in the 2020 Olympic Qualifying Tournament in Victoria, Canada, under coach Rick Pitino.