On August 31, 2013, Hakan Calhanoglu substituted Rafael van der Vaart in the 79th min. In the 80th min Calhanoglu scoring his first goal of the season for Hamburger SV making 3-0 over Braunschweig. Hakan Calhanoglu scored a fascinating free kick goal in the 90th min scoring his second goal of the season and the fourth goal for Hamburger SV over Braunschweig. Hamburger Sv wins the game 4-0. On November 24, 2013Hakan Calhanoglu scored his third goal of the season against Hannover 96. On November 29, 2013, Calhanoglu takes a wonderful long range free kick shot scoring his fourth goal of the season against Wolfsburg.
During the 2013-2014 Bundesliga Season, several clubs had shown interest. Hakan Calhanoglu has been linked with English club Arsenal and Liverpool, and Turkish clubs Galatasaray. Turkish media reported that Galatasaray and the two top English clubs would make an attempt to sign Hakan Calhanoglu in the winter transfer window.
Çalhanoğlu represented Turkey at the 2013 FIFA U-20 World Cup. On June 28, 2013, Hakan Calhanoglu scored a remarkable goal over Australia U20 making the score 1-1 in the 54th Min. Turkey U20 wins the game over Australia U20, with Okay Yokuslu wonderful chip shot just outside from the 18 yard box in the 90th min.