Avdić was born in Huskvarna, Sweden. He was 15 years old he was signed by Danish Superliga club Brøndby IF. He played for Brøndby's reserve team in the Danish 2nd Division East – the third tier of Danish football – but did not play any senior games for the club. In 2006, Avdić was released by Brøndby, as he wanted to live closer to his family in Sweden, and he was picked up by IF Elfsborg in the Swedish Allsvenskan championship. When he was signed by Elfsborg, he was praised by Elfsborg officials as one of the greatest talents in Swedish football. Avdić made his debut for Elfsborg in November 2006. He played from the start in Elfsborg's first ever Royal League match, and scored two goals in the 4–0 win over AIK. In the 2010 season of the Allsvenskan, Avdić changed position from attacking-midfielder to striker, his previous position as a youth player. He scored 19 goals, making him runner-up golden boot that season, after Alexander Gerndt who scored 20 goals. Due to this he was sold the same season for a transfer fee of £2 million to Werder Bremen. On 3 January 2011, Avdić became Werder Bremen's first new signing of the winter, as confirmed by the website of the German Bundesliga club. He signed a contract until summer 2014. He featured only on rare occasions for the team during the 2011–12 Bundesliga season. due to his repeating injuries. Before his loan to PEC Zwolle, Avdić played seven games in Bundesliga and 12 games for Werder's second team without scoring a single goal. On 29 August 2012, Avdić agreed to a loan to the Dutch football team PEC Zwolle in Eredivisie until the end of season 2013. And he scored his first goal for the club in his fourth game as a substitute. On 17 February 2013, in his 14th game against Feyenoord, Avdić made the match-winning 3–2 goal for Zwolle, which also meant his seventh goal at the time. This made him at the time the second best Swedish goalscorer in the 2012–13 season, only beaten by Zlatan Ibrahimović. Where experts claimed that he deserved a place in the Swedish national football team, due to Sweden's weak availability of good strikers. In summer 2013, Avdić joined AZ Alkmaar. He made his debut on 30 October in a KNVB Cup match against Achilles '29, scoring two goals. AZ won the match with 7–0. On 15 August 2014, as a result of having no prospect with AZ, he was sent on loan to Heracles Almelo until the end of the season. In February 2019, joined AFC Eskilstuna, newly promoted to Allsvenskan. He left the club at the end of the year.
