Aloisi allegedly struck the Adelaide assistant coach Ramallo after the Reds' dramatic 2-1 win against the Roar.
An Adelaide United spokesman said there was a physical clash between two assistant coaches of the respective clubs, but didn't name the individuals.
According to the United spokesman, an Adelaide assistant had been struck in the back in an unprovoked attack.
Meanwhile, a Football Federation Australia spokesman said the governing body is awaiting reports into the incident from the match commissioner and the respective clubs.
Once the reports are received later on Sunday night, the FFA will decide what action to take on Monday, the spokesman said.
The incident occured after the Roar were left seething at losing due to what their head coach John Aloisi said was a poor decision.
Brisbane slipped to a 2-1 loss after goalkeeper Michael Theo was controversially sent off in one of the last acts of the game.
Theo was shown a red card for elbowing Adelaide defender Dylan McGowan, with the match all but over, in the sixth minute of what was meant to five minutes of stoppage time at Adelaide's Coopers Stadium.
Adelaide's Sergio Cirio then slotted a 98th-minute penalty to deliver the Reds a win.
The drama came after Brisbane captain Matt McKay was helped from the field with medial ligament damage to his right knee - an injury his head coach says will sideline the stalwart for six weeks.
In the frenetic final minutes, Theo was attempting a quick throw-out when held by McGowan.
A furious John Aloisi said that as the goalkeeper went to throw, his elbow collected the Reds defender who crumbled, clutching his face.
"It should be a foul for us," Aloisi said.
"And if (referee Stephen Lucas) thinks it's deliberate, then he can send him off but it shouldn't be a penalty.
"But I don't know why he doesn't see the foul in the first place.
"I know Michael Theo very, very well and he wouldn't deliberately go to elbow someone."
Brisbane (33 points) remain fourth on the ladder but missed an opportunity to close the gap on third-placed Melbourne City (36 points).
Aloisi said it was pointless seeking clarification about the controversial call in coming days.
"We have had decisions go against us this year and we have asked for clarification ... but all we will get (from league hierarchy) is 'We made the wrong decision'," he said.
"But what can you do? We can't do anything. The game is gone."