Everton are keen to sell Richarlison next week.
The Blues need to sell the Brazil striker before June 1 in order to satisfy financial fair play requirements.
Such news is said to have put the two London giants on red alert with both having identified Richarlison as a primary target this summer.
The Brazilian is one of Everton's most valuable assets and is believed to want to leave this summer in search of pastures new.
Everton's need to balance the books means they will, according to reports, likely lose one key player before the window shuts on September 1.