West Ham have reportedly submitted an official bid in the region of £40m Conor Gallagher.
The report from Fabrizio Romano says Chelsea are yet to provide an official answer as discussions will take place over the coming days.
The Hammers are looking for midfield reinforcements after Declan Rice joined Arsenal earlier this month.
And they have plenty to spend having agreed a fee of £105m plus add-ons for their star man.
Gallagher struggled for minutes last season at Chelsea, despite impressing on loan at Crystal Palace the season before under Patrick Vieira.