As a child interested in various olympic sports at his early ages, Abdullah Avcı started his professional football career at the age of 15 at Vefaspor. After Vefaspor, he played for Karagumrukspor, Rizespor, Bakirkoyspor, Kasimpasaspor and Istanbulspor, respectively. He initiated his coaching career in Istanbulspor, where he ended his professional football career. He became the assistant coach of Ziya Dogan and later on he was appointed as the head coach of the team. After his spell at Istanbul side, he served as the coach of Galatasaray A2, Turkish U-17 National Team, Istanbul Buyuksehir Belediyespor and Turkish National Team.
In 2005, he had a historical achievement by becoming the European Champion with Turkish U-17 National Team.
As soon as Medipol Basaksehir promoted to the Turkish Super League at the end of the 2013-14 season with a totally new corporate identity, the club signed a 5 year deal with Abdullah Avcı in order to build a title contender from scratch. Avcı, did not only lead the team to reach the UEFA Europa League Qualifiers in his first , and also second year, but his team finished the league in the top 4 in every season consistently. 2016-17 season, his team was qualified for the UEFA Champions League for the first time by finishing second in the Turkish Super League. On June 10, 2019 he signed a three year deal with Beşiktaş.
With his proven tactical acuity and ability to build an environment that fosters excellence, he is considered as the greatest representatives of the modern football in Turkey.