Both Madrid teams now know who'll be taking charge of their Champions League second legs on Tuesday evening, with Hungarian referee Viktor Kassai appointed to Real Madrid's match with Bayern Munich and with Italian Gianluca Rocchi tasked with officiating Atletico Madrid's trip to Leicester.
41-year-old Kassai - who will be assisted by Gyorgy Ring and Vencel Toth - has been a UEFA referee since 2003 and has whistled several of Real Madrid's matches over the years, including their 3-0 comeback victory over Wolfsburg last season. He also has experience of a Real Madrid v Bayern Munich match, as he was the man in the middle for the semi-final which finished 2-1 in 2011/12.
Rocchi, meanwhile, is 43 years old and has been an elite UEFA referee since the start of the 2010/11 season.
His most recent experience with Los Rojiblancos came in last season's edition of the tournament when he oversaw their 2-1 home defeat against Benfica in the group stages.
At the King Power Stadium he will be flaked by Elenito Di Liberatore and Mauro Tonolini.