The Blues are thought to be preparing a third bid of around £30million after having two previous offers rejected for the 21-year-old.
However, United and neighbours Manchester City are also said to be monitoring the situation and could launch their own enquiries if the Toffees are willing to do business.
Manager Louis van Gaal has also been handed a massive boost in his pursuit of top target Thomas Muller.
That's why Van Gaal has refused to give up on signing the German despite having two bids - the last one around £60m - turned down by the German giants.
GETTY
Thomas Muller wants to move to Manchester United from Bayern Munich
In a battle for his signature, Premier league rivals Chelsea and City were also thought to be weighing up offers but it appears the Red Devils are now ready to land the Barcelona winger.
The 28-year-old will cost £22m and become United's sixth summer signing.
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