Arsenal, Real Madrid and Liverpool among the teams in action
Monaco's Dimitar Berbatov, centre, heads the ball during the Champions League Group C soccer match between Zenit and Monaco at Petrovsky stadium in St.Petersburg, Russia, Wednesday Oct. 1, 2014.Dmitry Lovetsky/The Associated Press
Zenit St. Petersburg's Nicolas Lombaerts, right, fights for the ball with AS Monaco's Lucas Ocampos during their Champions League soccer match at the Petrovsky stadium in St. Petersburg.ALEXANDER DEMIANCHUK/Reuters
Zenit Saint Petersburg's Oleg Shatov, centre, vies with Monaco's Geoffrey Kondogbia, right, during their UEFA Champions league group C football match Zenit Saint Petersburg vs Monaco in Saint Petersburg.OLGA MALTSEVA/AFP / Getty Images
Dortmund's Ciro Immobile scores a goal during the UEFA Champions League football match RSC Anderlecht vs Borussia Dortmund in Brussels.EMMANUEL DUNAND/AFP / Getty Images
Leverkusen's Stefan Reinartz, left, fights for the val with Benfica's Bryan Cristante during the Champions League group C soccer match between Bayer Leverkusen and Benfica in the BayArena in Leverkusen, Germany.Michael Probst/The Associated Press
Anderlecht's Matias Suarez, left, and Dortmund's Sokratis, right, hook arms as they vie for the ball during the Group D Champions League match between Anderlecht and Borussia Dortmund at Constant Vanden Stock Stadium in Brussels, Belgium.Geert Vanden Wijngaert/The Associated Press
Real Madrid's Portuguese forward Cristiano Ronaldo, left, vies with Ludogorets Razgrad's midfielder Svetoslav Dyakov during the UEFA Champions League Group B football match Ludogorets Razgrad vs. Real Madrid at the Vassil Levski stadium in Sofia.NIKOLAY DOYCHINOV/AFP / Getty Images
Basel's Ivorian midfielder Serey Die, left, vies with Liverpool's Italian forward Mario Balotelli during the Champions League football match between FC Basel and FC Liverpool on October 1, 2014 at the St. Jakob-Park stadium in Basel.FABRICE COFFRINI/AFP / Getty Images
Leverkusen's midfielder Stefan Reinartz and Benfica's Brazilian forward Derley vie for the ball during the first leg UEFA Champions League Group C football match Bayer 04 Leverkusen vs SL Benfica in Leverkusen, western Germany.PATRIK STOLLARZ/AFP / Getty Images
Arsenal's Danny Welbeck, right, scores a goal during their Champions League soccer match against Galatasaray at the Emirates Stadium in London.STEFAN WERMUTH/Reuters
Leverkusen's midfielder Hakan Calhanoglu, right, and Leverkusen's forward Stefan Kiessling celebrate during the first leg UEFA Champions League Group C football match Bayer 04 Leverkusen vs SL Benfica in Leverkusen, western Germany.PATRIK STOLLARZ/AFP / Getty Images
Arsenal's Calum Chambers, right, challenges Galatasaray's Semih Kaya during their Champions League soccer match at the Emirates Stadium in London.STEFAN WERMUTH/Reuters
Borussia Dortmund's Marcel Schmelzer, left, challenges Anderlecht's Youri Tielemans during their Champions League group D soccer match at the Constant Vanden Stock stadium in Brussels.FRANCOIS LENOIR/Reuters
Arsenal's Alex Oxlade-Chamberlain, right, challenges Galatasaray's Burak Yilmaz during their Champions League soccer match at the Emirates Stadium in London October 1, 2014.STEFAN WERMUTH/Reuters
Borussia Dortmund's Ciro Immobile, left, kicks the ball in front of Anderlecht's Ibrahima Conte during their Champions League group D soccer match at the Constant Vanden Stock stadium in Brussels October 1, 2014.FRANCOIS LENOIR/Reuters
Atletico's Juan Fran kicks a high ball during the Group A Champions League soccer match between Atletico de Madrid and Juventus at the Vicente Calderon stadium in Madrid, Spain, Wednesday Oct. 1, 2014.Andres Kudacki/The Associated Press
Dortmund's Lukasz Piszczek, left, vies with Anderlecht's Olivier Deschacht during the UEFA Champions League football match RSC Anderlecht vs Borussia Dortmund in Brussels.EMMANUEL DUNAND/AFP / Getty Images
Galatasaray goalkeeper Fernando Muslera removes a flare that fans had thrown onto the pitch during their Champions League soccer match against Arsenal at the Emirates Stadium in London.STEFAN WERMUTH/Reuters
Atletico's Tiago, centre out jumps Juventus' Fernando Lloriente during the Group A Champions League soccer match between Atletico de Madrid and Juventus at the Vicente Calderon stadium in Madrid, Spain.Andres Kudacki/The Associated Press
Galatasaray supporters light flares in the crowd during the UEFA Champions League, Group D football match between Arsenal and Galatasaray at The Emirates Stadium in north London.ADRIAN DENNIS/AFP / Getty Images
Arsenal's Chilean striker Alexis Sanchez celebrates with striker Danny Welbeck during the UEFA Champions League, Group D football match between Arsenal and Galatasaray at The Emirates Stadium in north London.ADRIAN DENNIS/AFP / Getty Images
Dortmund's hardcore fans known as "Ultras" light fireworks during the Group D Champions League match between Anderlecht and Borussia Dortmund at Constant Vanden Stock Stadium in Brussels, Belgium.Geert Vanden Wijngaert/The Associated Press