Leeds United manager Marcelo Bielsa

Ilan Meslier and Kamil Miazek are locked in a battle for the Leeds United number one shirt as the club prepare to lose Kiko Casilla to a lengthy ban for racial abuse, Football Insider understands.

A formal announcement of the FA probe into Casilla’s alleged racial slur at Charlton’s Jonathan Leko is expected next week and the goalkeeper’s punishment could see him suspended for up to 12 matches.

A Leeds source has told Football Insider that Marcelo Bielsa and his staff have been preparing for the possibility of an extended absence of their first choice goalkeeper.

The United manager has yet to make up his mind over whether to plump for French loanee Meslier, 19, or giant Pole Miazek, 23, but they have both been earmarked for their first starts.

Bielsa will weigh up which of the youthful duo is best able to cope with the burden of being the number one as well as play the risky passes from the back that he regards as integral to the team’s playing style.

Both have yet to play for the Leeds first team as Casilla has played every minute of the club’s 16 matches to date this season, including both of the League Cup fixtures.

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The former Real Madrid keeper is set to feature against QPR at Elland Road today, but that could be his last involvement until the new year.

Meslier and Miazek have each been on the bench for seven of Leeds’ Championship matches this season, while the Pole was the substitute keeper for the League Cup clashes against Stoke City and Salford.

Miazek has been Casilla’s deputy for the last six matches, but that has coincided with Pablo Hernandez’s absence due to injury.

The EFL’s strict rule on five loanees in the matchday squad led to a recall to the 18 for Jack Clarke,

Of the two young keepers, Meslier has the greater amount of senior experience after making 30 appearances for parent club Lorient’s first team in Ligue 2 in France.

In other Leeds United news, it can be REVEALED that Bielsa is preparing to make a major change of heart over one Elland Road player.