Bailly was shown a straight red card in the 87th-minute of United's semifinal second leg game against Celta Vigo on May 11, and Europe's governing body has now issued a three-game ban.
Bailly was sent off at Old Trafford after raising his hand to John Guidetti's face, sparking a brawl which also saw Celta defender Facundo Roncaglia dismissed.
Ex-CIA head says Trump remarks on Russian Federation interference 'disgraceful'
One of Mr Trump's lawyers, Jay Sekulow, said the president has not discussed the issue of pardons with his outside legal team. Both also said they were concerned about a second discussion the two leaders had in Europe with only a Russian interpreter.
Bailly emerged as United's top option in central defence previous year, as he was the rock manager Jose Mourinho built his team around.
United's next European match is the Super Cup showpiece against Champions League winners Real Madrid on August 8 in Skopje, Macedonia.
The dismissal cost the Ivory Coast defender a chance to play in the Europa League final against Ajax Amsterdam, which counted as the first match of his suspension.