Newcastle United owner and Sports Direct boss Mike Ashley is waiting to see whether he has won a High Court battle with an investment banker over a £15 million deal allegedly made in a London pub.

Investment banker Jeffrey Blue says 52-year-old Mr Ashley promised to pay him £15 million if he used his expertise to double Sports Direct’s share price to £8 a share.

He says Mr Ashley paid only £1 million and he wants £14 million damages.

Mr Ashley denies the claim and says Mr Blue is talking “nonsense”

Jeffrey Blue is involved in the disputeJeffrey Blue is claiming £14 million in damages (Nick Ansell/PA)

A judge has finished analysing evidence at a High Court trial in London.

Mr Justice Leggatt said he aimed to deliver a ruling in the near future.

The trial began last week and the judge has heard evidence from Mr Blue and Mr Ashley.

Ashley is the founder of Sports DirectAshley is the founder of Sports Direct (Joe Giddens/PA)

Lawyers representing both men on Wednesday outlined closing legal arguments.

Mr Blue was at the hearing on Wednesday. Mr Ashley was not at the hearing.