Manchester City forward broke a metatarsal in Monday’s 2-0 Premier League win at Bournemouth.
The 19-year-old was taken off in the 15th minute at Vitality Stadium after appearing to pick up the foot injury.
City said in a statement: “He will undergo further examinations in the coming days to establish the extent of his layoff.”
The Brazil international, who completed a £27m from Palmeiras in January this year, and has played five times for City.