Real Madrid's goalkeeper Iker Casillas, left, reacts next to other players at the end of a Champions League soccer match round of 16 second leg, between Real Madrid and Schalke 04 at Santiago Bernabeu stadium, in Madrid, Spain, Tuesday, March 10, 2015 (Photo: AP)

Real Madrid's Cristiano Ronaldo, right, celebrates next to team mates scoring his side's first goal during a Champions League soccer match round of 16 second leg, between Real Madrid and Schalke 04 at Santiago Bernabeu stadium, in Madrid, Spain, Tuesday, March 10, 2015 (Photo: AP)

Real Madrid's Cristiano Ronaldo celebrates after scoring his second goal during their round of 16 second leg soccer match at the Santiago Bernabeu stadium, in Madrid, March 10, 2015 (Photo: Reuters)

Bayern Munich's Thomas Mueller (3L) celebrates with Franck Ribery, Mario Goetze, Rafinha and Robert Lewandowski (L-R) after scoring a penalty goal against Shakhtar Donetsk during their Champions League Round of 16 second leg soccer match in Munich, March 11, 2015 (Photo: Reuters)

Shakhtar Donetsk's Serhiy Kryvtsov (R) reacts on ground after a goal by Bayern Munich's Robert Lewandowski celebrating with Thomas Mueller (2R) during their Champions League Round of 16 second leg soccer match in Munich, March 11, 2015 (Photo: Reuters)

Bayern Munich's Thomas Mueller (R) scores a penalty goal against Shakhtar Donetsk's Andriy Pyatov as Bayern Munich's Franck Ribery watches during their Champions League Round of 16 second leg soccer match in Munich, March 11, 2015 (Photo: Reuters)

Chelsea's goalkeeper Thibaut Courtois is beaten by a header from PSG's Thiago Silva, left, for PSG's second goal during the Champions League round of 16 second leg soccer match between Chelsea and Paris Saint Germain at Stamford Bridge stadium in London, Wednesday, March 11, 2015 (Photo: AP)

PSG's David Luiz celebrates with team mates after the Champions League round of 16 second leg soccer match between Chelsea and Paris Saint Germain at Stamford Bridge stadium in London, Wednesday, March 11, 2015 (Photo: Reuters)

PSG's David Luiz, centre, celebrates at the final whistle as Chelsea's Diego Costa, right, leaves the field after the Champions League round of 16 second leg soccer match between Chelsea and Paris Saint Germain at Stamford Bridge stadium in London, Wednesday, March 11, 2015 (Photo: AP)

Basel's goalkeeper Tomas Vaclik, center, fails to save the ball for the 3-0 during the Champions League round of sixteen second leg soccer match between FC Porto and FC Basel at the at Dragao Stadium in Porto, Portugal, Tuesday, March 10, 2015 (Photo: AP)

FC Basel's Behrang Safari (R) reacts at the end their Champions League round of 16 second leg soccer match against Porto at Dragao stadium in Porto, March 10, 2015 (Photo: Reuters)