During the 2013 winter transfer window, the player received an offer from Saudi club Ittihad FC, to replace Croatian player Anas Sharbini. However the deal fell through when his agent was unable to complete the transfer. The player had been expected to fly to Saudi Arabia to hold negotiations but obtaining a visa to Saudi Arabia would have taken two days and the transfer window would close on the following day, so the deal could not be completed.
On 1 August 2013, Adnan officially agreed to sign a five-year contract deal with Çaykur Rizespor. He chose the shirt number 53, as it was the same year the club Çaykur Rizespor was established, in 1953, stating that he feels that Çaykur Rizespor is like his home. On 1 September 2013, Adnan scored his first goal in the Turkish Süper Lig for Çaykur Rizespor against Kayseri Erciyesspor in the 7th minute from long distance. On 14 September 2013, Adnan scored his second goal with Çaykur Rizespor against Gaziantepspor from a free kick from 35 metres. Adnan contributed to his team with 4 goals and 10 assists, due to the football and the team he played, he became one of the fans' favorite footballers during his time playing at Çaykur Rizespor.
On 2 September 2013, Napoli made a €7 million transfer bid to Çaykur Rizespor for Adnan on a five-year deal, but it was rejected by Çaykur Rizespor's board of directors. According to the rizesporlular.com.