Mbeumo, 25, is interested in joining Manchester United and has turned down approaches from other Premier League teams, including Tottenham and Newcastle.
According to sources, any potential deal between Manchester United and Brentford has hit a roadblock, and Brentford has increased its asking price to £70 million.
Ratcliffe is adamant that Manchester United will not overpay for the Cameroon international Mbeumo.
Manchester United have struggled to make progress in the summer transfer window as they need to sell some players before they can buy new ones.
The club is expected to sell players such as Marcus Rashford, Alejandro Garnacho, Jadon Sancho, and Antony, but so far, no concrete offers have been received.
