Volatile tennis dad Damir Dokic has foreshadowed an appeal to a European Union court after he was sentenced to 15 months in jail for threatening to blow up the Australian ambassador to Serbia and possessing illegal weapons.

Tennis star Jelena Dokic is reportedly preparing to fly to Serbia from London to support her father and could arrive in Belgrade around 8pm Melbourne time at the earliest.

Dokic, 50, received a 10-month sentence on a charge of endangering the safety of Ambassador Clare Birgin and seven months for illegally owning two nail bombs and 20 bullets.

Immediately after the sentence was handed down overnight Australian time, Dokic's lawyer, Bosiljka Djukic, indicated she would appeal to the Ruma District Court and also to EU courts in Strasbourg due to lack of faith in local authorities.

"You can make your own conclusion on whether the sentence is political,'' she told reporters as she left court.