The Istanbul outfit are under investigation due to the legitimacy of their Turkish Cup victory in 2011, while the Romanian champions - due to compete in next season's Champions League following their title success this season - may not fulfil the criteria to participate in Europe."Proceedings have been opened against Steaua Bucharest on the basis of Articles 2.04.g, 2.05 and 2.10 of the 2013-14 Uefa Champions League Regulations, regarding the admission criteria for participation in Uefa competitions," a Uefa statement reads.
"Proceedings have also been initiated against Besiktas and two club officials in relation to match-fixing activities alleged to have taken place around the 2011 Turkish Cup final.
"Furthermore, following the investigation into alleged match-fixing activities involving Fenerbahce, the Uefa Disciplinary Inspector has submitted his findings to the Control and Disciplinary Body, in the context of disciplinary proceedings against this club and five club officials."
Both cases will be heard in Nyon on June 21, with Uefa's Control and Disciplinary Body to make a decision on both clubs' fate three days later.