Chelsea are holding out for up to £70m for Mason Mount after Manchester United had an opening bid of £40m rejected for the midfielder.
Manchester United are expected to return with an improved offer for Mount, who is keen a move to Old Trafford.
Mount has just one year left on his contract at Chelsea and the Blues are willing to sell him this summer so they do not risk losing him for nothing next summer.
Mauricio Pochettino had indicated he wants to keep Mount but the Argentine has seemingly been unable to exert any influence over his future amid a contract stand-off with Chelsea.
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Mount has turned down several offers of a new contract at Chelsea.
He does not want to leave his boyhood club but wanted a deal that would bring him closer in line with other senior members of the squad.
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Chelsea and England team-mate Reece James last year signed a six-year contract worth £250,000 a week, reflecting his status at Stamford Bridge.
United manager Erik ten Hag has identified Mount as one of his key summer transfer targets.
The 24-year-old appeared to say his Chelsea goodbyes after their final game of the season against Newcastle at Stamford Bridge.