Leeds finalised Casilla's free transfer from the Bernabeu yesterday, adding a full Spain global to their squad, following negotiations with the 32-year-old and the Spanish giants last week.
Casilla, part of Zinedine Zidane's squad in each of the past three seasons when the Spanish club lifted the Champions League, has made 43 appearances for Real since returning to the capital for £5m.
He was the backup goalkeeper at Real Madrid and will compete for a starting place at Leeds with Bailey Peacock-Farrell and Will Huffer.
Leeds United goalkeeper Kiko Casilla.
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Due to a confidentiality agreement, Mourinho did not directly discuss his time at United. Mourinho was sacked by Manchester United in December after a dismal start to the season.
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He was responding to Tomic's claims this week that Hewitt had ruined the national system and " no one likes him any more". Hewitt asserted that he didn't feel particularly threatened by the threats, and that he felt they were empty.
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The Scot will head back to the United Kingdom from Melbourne today, leaving behind a wealth of goodwill, admiration and respect. Last month he put a picture of himself swigging from a champagne bottle on Instagram and said: "Celebrating the end of 2018".
At the end of the 2014/15 La Liga campaign, Casilla was re-signed by Real Madrid, eight years after leaving for Espanyol.
The 32-year-old arrives at Elland Road with one Spanish worldwide cap to his name along with three Champions League winners' medals. "I don't have to make any comment on Casilla because his career speaks for itself".
"I think he is the complete player", said Bielsa.
"But Real Madrid will always be in my heart".
"Today has been his first training session so what I can say is that he won't play against Stoke, even if he's fit".
Bielsa's side now top the second tier, with the enigmatic Argentine coach proving to be a shrewd addition - despite questioning of his methods during the "spygate" scandal.