Manchester United are set to make a third bid of about £55m for Chelsea midfielder Mason Mount.
United will also warn they will walk away from negotiations with the Blues if the offer is not accepted.
Chelsea are reported to value Mount at £70m.
However, United feel that figure is excessive as Mount only has a year left on his contract and talks about an extension have stalled.
United have already had bids worth up to £40m and £50m for Mount rejected by Chelsea.
Mount, who has scored 33 goals in 195 appearances for Chelsea since making his debut in 2019, missed the end of the domestic season with injury as the Blues came 12th – their lowest finish for more than 25 years.
He won the Champions League in 2021 with Chelsea and started their 1-0 win over Manchester City in the final. He also won the Fifa Club World Cup and Uefa Super Cup with the Blues.