Barcelona take on Bayer Leverkusen at the Camp Nou in their second UEFA Champions League game.
The Bundesliga outfit won their first group stage game 4-1 over BATE Borisov while Barcelona drew 1-1 against Roma.
Manchester United have also been closely linked with the Turkish international and were linked with a €36 million for Çalhanoğlu according to Beyaz Tv.
Speaking live on the Derin Futbol show Turkish football pundit Ertem Şener claimed that United are expected to make a €36 million offer before the transfer deadline.
The Turkish international joined Bayer from HSV on a €15 million transfer last season and was selected as the sixth most valuable U-21 players in the world list by Soccerex.
Barcelona v Bayer Leverkusen
Kick-Off: 19:45 GMT
Stadium: Camp Nou, Barcelona, Spain
Barcelona confirmed line-up: Stegen, Jordi Alba, Javier Mascherano, Pique, Dani Alves, Andres Iniesta, Sergio Busquets, Ivan Rakitic, Neymar, Luis Suarez, Haddadi
Bayer Leverkusen confirmed starting line-up: Leno – Donati, Tah, Papadopoulos, Wendell – Kramer, Bender – Bellarabi, Kampl, Calhanoglu