Chelsea have issued a warning to club staff about the potential dangers of participating in Fantasy Premier League, according to sources who spoke with ESPN.

The concern centres on the risk that players' selections in the popular game could inadvertently reveal sensitive information about the club — such as injury updates or tactical decisions — before they are officially announced.

Fantasy Premier League requires participants to pick squads based on real players, meaning that a club insider selecting or dropping a player could hint at that individual's fitness status or expected involvement in an upcoming match.

The warning reflects a broader awareness among top-flight clubs about the unintended consequences of staff engaging with fan-facing platforms that intersect with insider knowledge. Chelsea are not the first club to raise such concerns internally, but the move underlines how seriously the west London side are taking information security as competition at the top of the Premier League intensifies.