This is coming less than 24 hours after Chelsea defender Zak Sturge returned to Stamford Bridge from his loan at Peterborough United.
Chelsea disclosed this in a statement via its website on Wednesday.
Santos joined Nottingham Forest last summer and made his debut under then-head coach Steve Cooper a few days later in a Carabao Cup defeat to Burnley.
The Brazil international, however, didn’t feature under new Nottingham Forest head coach Nuno Espirito Santo.
The 19-year-old returned to Stamford Bridge having made two appearances during his time at the City Ground.
