The Tories took a £5,000 donation funnelled through Peterborough United FC from the club’s Canadian co-owner, the Mirror understands.
The party has been accused of taking advantage of loopholes in the law to accept donations from non-UK citizens.
Mystery surrounded cash handed to the Conservatives by the club, after chairman Darragh MacAnthony publicly denied any knowledge of the gift, saying it had "nothing to do with me."