Casilla is a one-cap Spanish international and was part of the Real Madrid squads which won the Champions League three time in succession.
And he is now said to be ready to move on for the good of his career.
Leeds only need to buy Casilla out of the final 18 months of his contract to sign him.
Bielsa was said to be lining up a move for Newcastle’s Karl Darlow but was reportedly put off by the club’s £4million asking price.
Leeds are reportedly set to sign Kiko Casilla from Real Madrid (Image: GETTY)
Fraser Forster was also liked with a move from Southampton but Casilla now looks set to become Leeds’ first signing of the January transfer window.
Bielsa is looking to strengthen to consolidate their position at the top of the Championship.
Having conceded only 28 goals all season, Leeds have one of the joint-second meanest defence in the second tier.
Casilla is set to have a medical early next week (Image: GETTY)
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Leeds manager Marcelo Bielsa needs a new goalkeeper after Jamal Blackman broke his leg (Image: GETTY)
The clubarealso said to be looking to bring in some new faces in attack and Willem II’s Fran Sol has been linked with a switch to Elland Road.
Sol has 13 goals in the Eredivisie this season and is the division’s second top scorer.
The Spaniard, 26, has also been linked with Rangers and Celtic.