The parties have agreed in principle to a deal worth 15 million euros with up to five million euros in bonuses, Globo Esporte reported on Wednesday.
It added that the 18-year-old has also received an offer from Ligue 1 outfit Monaco.
Washington has made 16 first-team appearances for Santos since he was promoted from the club’s youth academy in January.
Chelsea currently have two other Brazilians in their senior squad: Defender Thiago Silva and midfielder Andrey Santos.
–Ajit Weekly News
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