Victorian police will test a mystery substance collected from the apartment of former AFL star Wayne Carey after his arrest following an alleged domestic dispute on Sunday.

Carey, 36, was doused with capsicum spray and handcuffed after he allegedly attacked two police officers investigating a report of a domestic dispute involving his live-in girlfriend, Kate Neilson, at their luxury apartment in Rouse Street, Port Melbourne, police said.

Carey had earlier phoned police to have a woman removed from the apartment.

The Herald Sun newspaper, citing an un-named police source, said Carey was now the subject of a drugs probe because of traces of a substance found in a bowl in his apartment on Sunday.

The source said the amount of the substance taken for testing was so small that even if it was found to be a narcotic charges were unlikely, the Herald Sun reported.

In other developments, former Carlton Premiership captain Wayne Johnston and his actress wife, Kate Kendall, confirmed they were among about 20 guests at a gathering at the apartment that broke up at about 7pm (AEDT) on Sunday, before the alleged incident occurred.

"During their attendance there was no impropriety, nor did they witness any incident between Wayne Carey and his girlfriend," the couple said in a statement through their lawyer, George Defteros.

The Herald Sun also revealed details of Ms Neilson's Myspace internet page, dated last March, in which she describes herself as "in love", but describes love as "a rollercoaster of exhilarating highs and exasperating lows".

Carey and Ms Neilson have gone to ground since news of the apartment incident broke on Sunday night.

As well as a Victoria Police investigation into the incident, he faces possible jail in the US state of Florida.

Police in Miami were called to a hotel to investigate a claim Carey had struck Ms Neilson in the face with a wine glass while the couple were on holiday.

Carey allegedly kicked one officer in the face and elbowed another and, when put into the police car, repeatedly headbutted the window separating him from the officers, Miami officers said.

Carey was charged with assault on a public servant, aggravated battery and resisting arrest with violence.

The first two charges carry jail terms of up to 15 years in prison, and the third up to five years in jail with each carrying a fine of up to $10,000.

Carey was on Wednesday sacked by the Nine Network as an AFL commentator, while radio station 3AW has announced it will not renew his contract with the station.

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