The US Treasury Department is probing offshore financial activity by President Trump’s former campaign manager Paul Manafort, according to a new report.

The feds are looking into Manafort’s financial transactions in connection with an anti-corruption investigation related to his work in Eastern Europe, according to the Associated Press.

The Treasury Department’s Financial Crimes Enforcement Network received the information on Manafort earlier this year from authorities in Cyprus, where Manafort is known to have made numerous financial transactions.

In 2014, Manafort was caught up in a $19 million deal to purchase a Ukrainian cable provider — and received the money through Cypriot shell companies.

The feds also are investigating a $1 million payment from October 2009 that went through the Bank of Cyprus. When the payment hit the Manafort-linked account, it was split almost in half and sent to accounts that appeared not to have an obvious owner.

A Treasury spokesman refused to comment. “We often get press inquiries concerning individuals and our policy is to never confirm, nor deny the existence, or non-existence, of any potential investigation,” he said.

On Wednesday, it emerged that Manafort had a secret $10 million deal with Russian billionaire Oleg Deripaska that benefited Vladimir ­Putin.

In a 2005 memo to the Russian businessman, Manafort pitched his services as a way to help Deripaska, as well as Russian President Putin, whom Trump has praised.

“We are now of the belief that this model can greatly benefit the Putin government if employed at the correct levels with the appropriate commitment to success,” the longtime US political consultant wrote.

With Post wires