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LIVERPOOL, ENGLAND - MARCH 06: Porto goalkeeper Iker Casillas walks out onto the pitch for the UEFA Champions League Round of 16 Second Leg match between Liverpool and FC Porto at Anfield on March 6, 2018 in Liverpool, England. (Photo by Simon Stacpoole/Offside/Getty Images)

LIVERPOOL, ENGLAND - MARCH 06: Porto goalkeeper Iker Casillas walks out onto the pitch for the UEFA Champions League Round of 16 Second Leg match between Liverpool and FC Porto at Anfield on March 6, 2018 in Liverpool, England. (Photo by Simon Stacpoole/Offside/Getty Images)

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LIVERPOOL, ENGLAND - MARCH 06: Iker Casillas of FC Porto applauds after the UEFA Champions League Round of 16 Second Leg match between Liverpool and FC Porto at Anfield on March 6, 2018 in Liverpool, England. (Photo by Simon Stacpoole/Offside/Getty Images)

LIVERPOOL, ENGLAND - MARCH 06: Iker Casillas of FC Porto applauds after the UEFA Champions League Round of 16 Second Leg match between Liverpool and FC Porto at Anfield on March 6, 2018 in Liverpool, England. (Photo by Simon Stacpoole/Offside/Getty Images)

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Porto's Spanish goalkeeper Iker Casillas gestures during the UEFA Champions League round of sixteen second leg football match between Liverpool and FC Porto at Anfield in Liverpool, north-west England on March 6, 2018. / AFP PHOTO / PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP via Getty Images)

Porto's Spanish goalkeeper Iker Casillas gestures during the UEFA Champions League round of sixteen second leg football match between Liverpool and FC Porto at Anfield in Liverpool, north-west England on March 6, 2018. / AFP PHOTO / PAUL ELLIS        (Photo credit should read PAUL ELLIS/AFP via Getty Images)