The former Real Madrid defender had an oral agreement with the Ligue 1 outfit but was instead tempted by the promise of more game time in Turkey
SPECIAL REPORT
Pepe had agreed to join Paris Saint-Germain but signed for Besiktas instead because the French club refused to give him a two-year contract.
The Portugal international was a free agent after being released by Real Madrid this summer, but PSG were initially sceptical about signing the 34-year-old centre-half, who has a history of knee problems.
However, an oral agreement was eventually reached after lengthy negotiations with Pepe's agent, Jorge Mendes, and the defender underwent a fitness assessment by members of PSG's medical team.