UEFA's appeals body met on Wednesday morning to listen to the Polish champions' arguments over the registration error that turned their 6-1 aggregate win over Celtic into an away-goals defeat.
A statement from Legia read: "The meeting of the UEFA Appeal Body was held in the morning, with Legia Warsaw co-owner Dariusz Mioduski and his associates present.
"The atmosphere during the meeting was fully professional and the club's representatives were granted the possibility to thoroughly present their stand on the issue.
"The decision of the UEFA Appeal Body is to be announced in the evening or tomorrow morning.
"Legia Warsaw would like to thank the UEFA disciplinary bodies for the prompt organisation of the appeal procedure.
"At the same time, we would like to inform you that until the official decision of the UEFA appeal body is announced the club will not issue any further communication."
Luis Suarez will learn on Thursday whether his four-month ban for biting Giorgio Chiellini at the World Cup has been reduced.
Suarez has taken his appeal to the Court of Arbitration for Sport, which has announced it will deliver its verdict at 3pm local time (2pm BST) on Thursday, having heard the case last week.
"The Court of Arbitration for Sport (CAS) will announce its decision in the matter Luis Suarez, FC Barcelona & the Uruguayan FA on Thursday 14 August 2014 at around 3pm. This case was heard on 8 August 2014 at the CAS offices in Lausanne," a statement said.
"At the request of the Appellants and with the agreement of FIFA, the CAS has conducted an expedited arbitration procedure. As a consequence, the CAS Panel has accepted to render its decision within a short period of time but with grounds to follow later."
Suarez was sent home from the World Cup in disgrace after he sank his teeth into Italy defender Chiellini and world governing body FIFA hit him with a four-month ban from all football, a nine-match suspension from international matches, and a hefty fine.
It was the third time Suarez had been found guilty of biting an opponent in his career. While he was at Ajax, Suarez bit PSV Eindhoven's Otman Bakkal in November 2010, and while at Liverpool he bit Chelsea defender Branislav Ivanovic in April 2013.
However, this summer's incident did not deter Barcelona from completing a £75million deal to sign the 27-year-old from Liverpool after the World Cup.