The Charity Commission says it is "seeking information" from Chelsea after the club was placed under the control of its charitable foundation.
On Saturday Chelsea's Russian owner Roman Abramovich announced he was handing trustees of the foundation "the stewardship and care" of the club.
The billionaire, who would remain the club's owner, made the move amid Russia's invasion of Ukraine.
The Charity Commission says it has received a report from the foundation.
"We have contacted the charity seeking information and, in line with our guidance, the charity has also made a report to the Commission," the Commission said.