Turkish giants Fenerbahce and Besiktas are facing UEFA match-fixing charges at the end of the month.
Romanian champions Steaua Bucharest are also set to face a probe.
Besiktas' charges related to allegations surrounding the 2011 Turkish Cup final.
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Fenerbahce's President Aziz Yildirim is currently serving a six year jail sentence for his part in a recent match-fixing scandal which also saw the club barred from the 2011/12 Champions League.
Five club officals will face a Uefa's Control and Disciplinary Body on June 21st, alongside representatives from Besiktas and Steaua.