Neymar swapped Barcelona for Paris Saint-Germain in controversial circumstances in 2017 and Lionel Messi is unsure if a return is possible.
Manchester City boss Pep Guardiola is concerned about player welfare due to increased demands, saying: "It's too much."
Paris Saint-Germain head coach Thomas Tuchel has lost Neymar for four weeks and warned too many demands are being placed on top players.
Neymar will be pushed hard while he remains a Paris Saint-Germain player, coach Thomas Tuchel has promised.
Paris Saint-Germain expect to be without Neymar for four weeks because of a hamstring problem.
Neymar was withdrawn with a knock during Brazil's friendly against Nigeria, but Tite insists he was not a pre-match worry.
Paris Saint-Germain star Neymar was substituted in the 12th minute of Brazil's clash with Nigeria due to a suspected hamstring issue.
Brazil goalkeeper Alisson does not think team-mate Neymar has to leave Paris Saint-Germain to become the world's best player.
Barcelona bolstered several areas in the most recent transfer window. Now they are looking at strikers, with Kylian Mbappe a dream target.
Brazil are winless in three matches after a draw against Senegal and Thiago Silva wants more clinical finishing to get them out of a rut.