CELTIC could be given a shock reprieve into the Champions League after it emerged that Legia Warsaw may have fielded an ineligible player in their 2-0 win over the Hoops on Wednesday night.
Defender Bartosz Bereszynski appeared as an 85th minute substitute against Celtic, despite being suspended for the match after being sent off in a Europa League tie last season.
Bereszynski would have served two matches of his three- game ban if he had been registered by Legia for the second round qualifiers against St Patrick's Athletic.
But since he wasn't listed for that game, his suspension should have been carried over to cover the matches against Celtic.
A statement from the Polish champions said: "In connection with the second leg third qualifying round of the Champions League, Celtic v Legia Warsaw, UEFA opened an investigation on the participation by Bartosz Bereszynski.
"The club is preparing relevant information which will be sent to UEFA today. "
Should Legia be booted out it will be an incredible turnaround, with Hoops manager Ronny Deila under intense pressure after the 6-1 aggregate defeat.
Three years ago, Celtic benefitted from a similar situation when Sion were kicked out of the Europa League after disobeying a transfer ban and using six ineligible players as they eased to a 3-1 aggregate win to book a place in the group stages of the Champions League.