The Blues are assessing Estevao Willian, who is only 17, has been called Messinho" by fans.
He has impressed hugely at Palmeiras and is wanted by a host of top clubs, per UOL.
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Chelsea are ready to make a big offer, with their bid split into a guaranteed and add-ons portion.
Willian already has 547,000 Instagram followers, with many fans believing he is the next superstar along with Endrick.
He was the youngest Brazilian player to secure a deal with Nike at the age of 10.