Amanda Staveley, the businesswoman at the centre of the reported Newcastle United takeover, has told a High Court judge how her firm earned around £5m from its involvement in the sale of Manchester City.
Ms Staveley is currently embroiled in a £1.6bn battle with Barclays bank.
She claims the bank owes her firm, PCP Capital partners, for work it did setting up a Middle East investment deal with the bank during the 2008 global financial crisis.
Barclays has disputed the claim and said it is "made of sand".
Ms Staveley is currently giving evidence at the trial.
She also said PCP Capital Partners had been "looking at" Liverpool before becoming involved with Manchester City.
Reports in recent weeks have suggested a deal is close to being finalised for a Saudi-led consortium to buy Newcastle United.
The PA news agency said in April it understood the Premier League's owners and directors test was the final hurdle in the negotiations.
The court trial is expected to last two weeks.