Warner, who is set to play a key role in the ICC Champions Trophy and the following Ashes series in England, posted unsavoury comments on Twitter toward journalists Robert Craddock and Malcolm Conn after taking exception to the former's article over the Indian Premier League.
Warner was subsequently reported by Cricket Australia for breaching Rule 6: Unbecoming Behaviour and was fined 5,750 Australian dollars (£3,700), the maximum financial penalty for a first-time offender, at the hearing on Wednesday.
The 26-year-old said: "In hindsight, clearly I let my frustrations get the better of me and posted some inappropriate tweets last weekend.
"While I disagreed with the story and my image being used alongside the story, I could have chosen my words better and I apologise for any offence that my language may have caused.
"I'll continue to have honest conversations with all my followers and I will be mindful of the language I use in future."
- Sports & Recreation
- Malcolm Conn
- Robert Craddock