The Swiss side could be sanctioned for fielding players in the Europa League signed while the club were under a transfer embargo.

Scottish side Celtic could be reinstated if Sion are expelled from the competition for a breach of the rules.

A UEFA spokesperson today told Press Association Sport no date has been set for the meeting of UEFA's Control and Disciplinary Body.

Celtic suffered a 3-1 aggregate loss to the Swiss side, who have five players in their squad - Feindouno, Mario Mutsch and Gabri, Jose Goncalves and Billy Ketkeophomphone - who are, in the eyes of FIFA, ineligible to play in the competition.

FIFA claim Sion breached a transfer embargo, but the club claim the ban on bringing players in had ended.

Sion's European squad was approved by the Swiss FA who, along with the club, have reportedly been warned by UEFA general secretary Gianni Infantino about possible sanctions.