Celtic were held to a 1-1 draw away to Maribor in the first leg of the Champions League play-offs on Wednesday, while Porto took control of their tie against Lille after securing a 1-0 victory in France.
Manchester United completed the 20 million euro signing of Argentina World Cup defender Marcos Rojo from Sporting Lisbon on Wednesday with Old Trafford boss Louis van Gaal hailing the 24-year-old as a "gifted" player.
Nine-man Guangzhou Evergrande crashed 1-0 to Western Sydney Wanderers Wednesday in a stormy AFC Champions League quarter-final first leg that left their coach Marcello Lippi facing possible disciplinary action.
Scottish champions Celtic will look to use their reprieve from Champions League oblivion and gain a positive result away at Slovenian titleholders Maribor on Wednesday in the first leg of their play-off.
Arsenal head for the home leg of their Champions League play-off against Besiktas with their hopes intact after surviving the test of a raucous Istanbul crowd and hugely-energised opponents to leave Turkey with a goalless draw.
Arsenal on Tuesday survived the test of a raucous Istanbul crowd and a hugely-energised Besiktas side to leave Turkey with a goalless draw and their hopes intact of advancing to the Champions League group stage.
Barcelona striker Luis Suarez said he has received professional help after receiving a four-month ban for biting an opponent for the third time in his career when he clashed with Italy's Giorgio Chiellini at the World Cup.
Just three months after remarkably breaking Barcelona and Real Madrid's grip on the La Liga title, Atletico Madrid boss Diego Simeone has denied any repeat of their miracle championship triumph is possible.