Despite scoring crucial goals against Liverpool, Swansea and Paris Saint-Germain at the end of last season, the Senegalese striker struggled to earn a regular place in Jose Mourinho's matchday plans.
"Talks are ongoing. Chelsea initially wanted £10 million for Ba but we have negotiated a price we are happy with. We'll tell the media once the final deal is done."
Ba heavily hinted at a potential move to Besiktas earlier in the summer when he posted a picture of their fans on his Instagram page.
Besiktas are currently coached by former West Ham and Everton star Slaven Bilic and finished third in the Turkish League last season.
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- Atletico Madrid
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- Demba Ba