Papagiannis was born in Marousi, a northern suburb of Athens, Greece, and spent his early years in Megara, in the western region of Athens. Papagiannis played at the Jordan Brand Classic International Game in 2013. He announced that he was committing to Westtown School in West Chester, Pennsylvania, in May 2013. He then attended school and played basketball at Westtown, during the 2013–14 academic school year and basketball season, as a high school junior. After his junior year of high school in the United States, he transferred to the American School in Athens, Greece, for his senior year of high school.\n', '

Papagiannis made his senior men\'s club debut with Peristeri on January 5, 2012, at the age of 14, in a Greek Basket League 2011–12 season game against Panathinaikos. He became the youngest player to ever play in the modern era of the Greek Basket League (since the league first became fully professional, under the organization of HEBA, starting with the 1992–93 season). He also spent the entire 2012–13 season with Peristeri.\n', '

On June 25, 2014, Papagiannis signed with Panathinaikos on a multi-year deal, yet there was a player option in the contract, which allowed him to leave Panathinaikos for a US college during the summer of 2015. Papagiannis, considered to be one of the biggest young European talent prospects, received scholarship offers from 17 USA colleges, including UConn, Arizona, Temple, NC State, Oregon, St. John\'s, and Kentucky. On July 8, 2015, it was announced that Papagiannis had chosen to continue playing for Panathinaikos. His Panathinaikos contract included a €500,000 euros buyout option.\n', '

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