Czech Republic international Tomas Sivok has completed his transfer from Bursaspor to Beşiktas according to Fanatik.
Sivok enjoyed a seven season spell at Beşiktaş winning the league title in 2008-09.
The experienced defender will sign a one year contract and Bursaspor will have a clause to extend his deal at the end of the season.
The agreement is reported to be worth €1 million per-season and the official signing ceremony will be held in the next few days.
Sivok scored a total of 19 goals and provided six assists in 203 appearances for the Black Eagles.
The 31-year-old defender made 21 appearances for Beşiktaş last season.
Former Beşiktaş manager Slaven Bilic was reported to be keen on Sivok staying but the former Croatian manager resigned at the end of the season and his replacement Şenol Güneş did not see a future for the defender at the club.
Beşiktaş finished last season in sixth place and reached the Turkish Cup final.