Noel Whelan has ripped into the form of Leeds United goalkeeper Kiko Casilla after his shaky performances across December.

The former Leeds striker and lifelong fan at Elland Road, speaking exclusively to Football Insider assistant editor Russell Edge, says that the Spanish stopper has been out of sorts since the 3-3 draw against Cardiff City.

The 33-year-old has been a mainstay in Marcelo Bielsa’s starting XI since his arrival at Elland Road but has come under fire for a number of high-profile mistakes.

Having seen the keeper concede four in the 5-4 win over Birmingham City, Whelan says Casilla is not showing the form which kept him as Real Madrid’s number two for so many years.

“He’s not covered himself in glory, starting from the Cardiff game,” Whelan told Football Insider.

“We saw him again, I don’t know how to put it into words without being too disrespectful – they’re schoolboy errors, you shouldn’t be expecting that from a Real Madrid number two over his career.

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“He’s been at Real Madrid, you don’t expect that goalkeeping. I know everyone’s prone to mistakes but these are really bad mistakes and ones you wouldn’t expect to see at under-23 levels at times.

“His decision making and quality has got to be so much better. I’m not sure if it’s the Christmas period but I think he’ll be the first to admit he can do better in situations like this and he should be expecting better from himself.”

Casilla has been an ever-present for the Whites this season, starting in all 25 Championship and both League Cup games.

In other Leeds United news, Whelan claims one Elland Road player has proved people wrong in “difficult conditions”.