Manchester City manager Sven-Goran Eriksson has revealed he decided not to appeal against Martin Petrov's red card because of what happened to Jeremie Aliadiere. Petrov will serve a three-match suspension, starting with the Premier League home match against Wigan, after kicking out at Leon Osman during Monday's defeat to Everton. Although Eriksson claimed the Bulgarian had been harshly treated, he has let the matter rest. That is because Middlesbrough striker Aliadiere's ban was increased from three matches to four after he slapped Liverpool's Javier Mascherano. Eriksson said: 'It is probably better not to appeal as that was a strange decision. 'If you make a bad tackle and injure someone then that is much more dangerous but perhaps the FA want to give examples to young people. 'They don't want you to put your hand in the face of another player or kick out, even if it is a small kick. 'I can understand that as we are models for young people, boys and girls. 'If they see players getting away with it, they might use those things, so it is up to us not to do it in the future.'