The 28-year-old also thanked fans for showing him support throughout 2015 and showing him understanding.
Turan joined Barcelona on a five-year deal from Atletico Madrid over the summer but the reigning La Liga champions were unable to register the bearded winger due to the FIFA transfer ban imposed on the club.
The fiery winger is expected to wear the number 7 shirt for Barcelona over the second half of the season.
Barcelona will be able to register Turan when the transfer window opens in January and he is expected to make his debut on 6 January.
Turan is the most currently the most successful Turkish international player to leave the Super League and has won every domestic trophy in Turkey and Spain as well as every European competition trophy except the Champions League – although he was part of the Atleti team that reached the Champions League final.