After former Fluminense midfielder Darío Conca transferred in 2011 , some notable signings during the 2012 seasons included former Chelsea forward Didier Drogba and Nicolas Anelka , former Barcelona midfielder Seydou Keita and Fábio Rochemback , former Sevilla forward Frédéric Kanouté , former Blackburn Rovers forward Yakubu and former Borussia Dortmund forward Lucas Barrios .
The transfer of Yakubu Aiyegbeni to the Chinese Super League was one of the most important of the 2012 season .