Porto's Spanish goalkeeper Iker Casillas during the Premier League 2016/17 match between FC Porto and CD Feirense, at Dragao Stadium in Porto on April 23, 2017. (Photo by Pedro Lopes / DPI / NurPhoto via Getty Images)
Porto's Spanish goalkeeper Iker Casillas during the Premier League 2016/17 match between FC Porto and CD Feirense, at Dragao Stadium in Porto on April 23, 2017. (Photo by Pedro Lopes / DPI / NurPhoto via Getty Images)