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The Tigers take on Leeds Rhinos at Old Trafford this weekend.

But Castleford will be without full-back Hardaker, the Super League club have confirmed.

Daryl Powell’s side have not explained the background to the breach.

But they clearly feel the incident was serious enough to drop England international Hardaker for the biggest game in their 91-year history.

The 25-year-old has enjoyed a stunning return to form in his first season with the Tigers following his exit from Leeds back in June.

(Image: GETTY)

Castleford explained in a club statement: “Zak Hardaker is unavailable for selection due to a breach of club rules.

“The club will make no further comment at this point as full attention is focused on Saturday’s Grand Final.”

Hardaker, a former Man of Steel, has been one of the best players this year and has scored 13 tries in 30 games to help Castleford reach the Grand Final.

The three-time Super League winner is no stranger to hitting the headline for the wrong reasons.

He missed the Rugby League World Cup in 2013 due to off-field problems and was slapped with a hefty fine.

He was also sent on an anger management course following issues while at Leeds during the 2015 campaign.

Meanwhile, Castleford have named their 19-man squad for the Grand Final.

Powell has made two changes from the dramatic win over St Helens in the semi-final last week with Oliver Holmes and Jy Hitchcox returning.