A UEFA investigation began following Legia's 6-1 aggregate win over Ronny Deila's side after the introduction of Bartosz Bereszynski, who should have been serving a suspension, in the 86th minute of the second leg on Wednesday.
Legia were already 2-0 ahead in the second leg, and five goals clear of their hosts, at Murrayfield when the attacker replaced Michel Zyro.
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