Published Thursday, 07 August 2014
Callum McGregor scored the only goal in the tie for the Hoops. (© Getty)
The Polish side has confirmed that they have been asked for information from the European governing body over the possibility a player was ineligible to play in the two sides' fixture.
Defender Bartosz Bereszynski made an appearance as a substitute two minutes before the end of Legia's 2-0 second-leg victory at Murrayfield Stadium.
The player had been sent off in the Polish champions final Europa League tie last season against Apollon Limassol and had been suspended for three games.
A statement on Legia's official website read: "The club announces that in connection with the Celtic FC-Legia Warsaw match in the second leg of the third qualifying round of the Champions League, UEFA opened an investigation into the participation of Bartosz Bereszynski.
"The club is preparing the relevant information and explanations, which will be sent to UEFA today.
"The result of the investigation will be announced immediately after its completion."
Previously, however, Uefa has favoured financial penalties on clubs that field ineligible players over excluding teams.
© UTV News