Images of Tuesday's Champions League action
Steaua Bucharest's Daniel Georgievski reacts after scoring an own goal during their Champions League soccer match against Chelsea at the National Arena in Bucharest October 1, 2013.BOGDAN CRISTEL/Reuters
Porto's Josue, left, kicks the ball past Atletico Madrid's Miranda during their Champions League soccer match at Dragao stadium in Oporto, northern Portugal, October 1, 2013.JOSE MANUEL RIBEIRO/Reuters
Ajax Amsterdam's Viktor Fischer, left and AC Milan's Ignazio Abate jump for the ball during their Champions League soccer match at the Amsterdam Arena stadium October 1, 2013TOUSSAINT KLUITERS/Reuters
Basel's Marco Streller challenges Schalke 04's Benedikt Hoewedes (front) during their Champions League Group E soccer match at St. Jakob-Park in Basel October 1, 2013.ARND WIEGMANN/Reuters
Schalke 04 fans light flares before their Champions League Group E soccer match against Basel at St. Jakob-Park in Basel October 1, 2013.RUBEN SPRICH/Reuters
Atletico Madrid's Leo Baptistao grimaces in pain as he collides with Porto's Eliaquim Mangala during their Champions League soccer match at Dragao stadium in Oporto, northern Portugal, October 1, 2013.MIGUEL VIDAL/Reuters
AC Milan's Cristian Zapata and Ajax Amsterdam's Kolbeinn Sigthorsson try to control the ball during their Champions League soccer match at the Amsterdam Arena stadium October 1, 2013.MICHAEL KOOREN/Reuters
Schalke 04's Kevin-Prince Boateng reacts after missing a chance to score against Basel during their Champions League Group E soccer match at St. Jakob-Park in Basel October 1, 2013.RUBEN SPRICH/Reuters
(L-R) AC Milan's Mario Balotelli, Ajax Amsterdam's Stefano Denswil and Ricardo van Rhijn jump for the ball during their Champions League soccer match at the Amsterdam Arena stadium October 1, 2013.TOUSSAINT KLUITERS/Reuters
Arsenal's Mesut Ozil celebrates after scoring a goal against Napoli during their Champions League soccer match at the Emirates stadium in London October 1, 2013.EDDIE KEOGH/Reuters
Celtic's Giorgios Samaras, left, challenges Barcelona's Gerard Pique during their Champions League soccer match at Celtic Park in Glasgow, October 1, 2013.NIGEL RODDIS/Reuters
Arsenal's Mezut Ozil, centre, celebrates with teammates after scoring a goal against Napoli during their Champions League soccer match at the Emirates stadium in London October 1, 2013.EDDIE KEOGH/Reuters
Porto's Steven Defour, right, and Atletico Madrid's Raul Garcia challenge for the ball during their Champions League soccer match at Dragao stadium in Oporto, northern Portugal, October 1, 2013.MIGUEL VIDAL/Reuters
Napoli's Miguel Britos reacts after a missed opportunity during their Champions League soccer match against Arsenal at the Emirates stadium in London October 1, 2013.DYLAN MARTINEZ/Reuters
Celtic supporters hold up banners before their Champions League soccer match against Barcelona at Celtic Park in Glasgow, October 1, 2013.NIGEL RODDIS/Reuters
Basel's Taulant Xhaka and Schalke 04's Marco Hoeger jump for a header during their Champions League Group E soccer match at St. Jakob-Park in Basel October 1, 2013.ARND WIEGMANN/Reuters
Atletico Madrid's Tiago, right, and Porto's Lucho Gonzalez challenge for the ball during their Champions League soccer match at Dragao stadium in Oporto, northern Portugal, October 1, 2013.JOSE MANUEL RIBEIRO/Reuters