Luis Suárez, who bit fellow professional Giorgio Chiellini in the match between Uruguay and Italy, has been found to be in breach of FIFA's Disciplinary Code.
FIFA's decision has been published on their website.
The player will almost certainly appeal. But as it stands, he is banned for 9 matches with Uruguay which will carry through to whatever World Cup matches the team manages to play and then on into their next qualification matches.
The player Luis Suárez is banned from taking part in any kind of football-related activity (administrative, sports or any other) for a period of four (4) months in accordance with art. 22 of the FDC.
There is also a stadium ban in effect.
There was some initial confusion about whether or not FIFA's punishment, with its reference to "administrative" activity, included a transfer ban. Today, ESPN and the Press Association's Martyn Ziegler both sought confirmation from FIFA that it did not.
In practical terms, this means that Suárez can still come to Real Madrid should the club be set on the transfer.
He would miss several league games and 3 Champions League group stage matches if the club still wants him.
La Liga has not yet published the fixture list for the coming season, but his first competitive match for Madrid could only take place on the first weekend of November.