Bernardo Silva said his tweet to team-mate Benjamin Mendy was a "joke" but the Football Association is to investigate his post.
Benjamin Mendy did not appear to take offence at a post from team-mate Bernardo Silva that prompted accusations of racism.
Manchester City claimed their biggest top-flight win by beating Watford 8-0 and they have made a habit of going big under Pep Guardiola.
There was an overreaction to Manchester City's Norwich City defeat, according to boss Pep Guardiola after Saturday's Watford mauling.
Manchester City scored five times inside the opening 18 minutes against Watford, much to the amazement of Bernardo Silva.
Watford followed their 6-0 FA Cup final loss to Manchester City with an 8-0 defeat at the Etihad Stadium - and it could have been worse.
Manchester City thrashed Watford 8-0, Everton lost 2-0 to Sheffield United at home, while Leicester and Burnley both claimed home wins.
Bernardo Silva plundered a hat-trick as Manchester City scored five times in the opening 18 minutes against an insipid Watford side.
Questions were asked of Manchester City's title credentials after losing at Norwich City but Bernardo Silva is ignoring his side's critics.
Following high praise from Pep Guardiola, Manchester City talent Phil Foden has been tipped for big things by team-mate Bernardo Silva.