Casillas won the Champions League three times with Madrid as well as the World Cup and two European Championships with Spain.
Loader, 19, is expected to sign a three-year deal with Porto in the next 48 hours, sources have told ESPN.
Coach Jorge Jesus is leaving Brazilian champions Flamengo to return to his native Portugal for a second spell in charge of Benfica.
FC Porto won their 29th Portuguese league title with two games to spare, beating Sporting Lisbon to clinch the crown over Benfica.
Iker Casillas has called time on his five-year spell with Porto after his contract with the Portuguese club expired on Wednesday.
Arsenal are tracking Porto's Danilo Pereira and plan to explore the possibility of a summer move in the coming weeks, sources have told ESPN.
Roma forward Mirko Antonucci has seen his loan terminated with Portuguese side Vitoria Setubal due to an over-use of the social media TikTok.
Headlining Africans Abroad, Dayot Upamecano saw red this weekend as RB Leipzig's faint title hopes faded further in a draw with Paderborn.
A bus carrying the Benfica football team was stoned on Thursday, breaking the glass and injuring two players.
Portuguese champions Benfica passed up the chance to move clear of title rivals Porto as they were held to a 0-0 draw at home to lowly Tondela.
Leaders Porto suffered a shock 2-1 defeat at Famalicao as Portugal's Primeira Liga became the latest league to return to action.
Former Sporting Lisbon president Bruno de Carvalho was acquitted on Thursday "moral responsibility" regarding fans' attack during training in 2018.
If their plan for Jadon Sancho falls through, Chelsea are likely to bid for Porto winger Jesus Corona. Transfer Talk is LIVE with the latest.
Portuguese club Santa Clara have been forced to train and play home matches 892 miles away due to coronavirus restrictions.
FIFA are investigating after Sampdoria lodged a complaint against Sporting Lisbon following Bruno Fernandes' transfer to Manchester United.
Cristiano Ronaldo has sent a message congratulating his boyhood club, whose facilities he used during isolation, on their Portugal League promotion.
Sporting CP president Frederico Varandas has announced he will offer his services as a doctor during the coronavirus crisis.
AC Milan forward Rafael Leao has been ordered to pay €16.5 million to former side Sporting Club for unilaterally terminating his contract in 2018.
Iker Casillas has said he is "absolutely calm" after his home was among those targeted in a series of raids.
Porto forward Moussa Marega called the racist incident he endured in Sunday's league match at Vitoria Guimaraes a "massive humiliation."
Former Real Madrid goalkeeper Iker Casillas has announced his intention to run for the role of president for Spanish FA.
An alleged racist incident marred a Portuguese league match as Porto forward Moussa Marega walked off midway through a match due to abuse from fans.
Iker Casillas intends to stand for election as president of the Spanish football federation, sources have confirmed to ESPN.
Manchester United have completed the signing of Bruno Fernandes from Sporting CP in a deal which could be worth up to €80 million.
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