The brother of Toronto Mayor Rob Ford is calling a Muskoka woman a "liar," after she said the mayor is still in contact with alleged drug dealer Alessandro (Sandro) Lisi.

Councillor Doug Ford, who is also managing his brother's re-election campaign, told reporters Thursday that there's no truth to the account given by LeeAnne McRobb, a Muskoka woman arrested for impaired driving in the mayor's car, to the Toronto Sun.

"I'm saying she's lying, unequivocally. 100 per cent," Doug Ford said. "He's ended his relationship with Lisi, absolutely, 100 per cent."

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The Globe made repeated attempts to reach Ms. McRobb and her family, but requests for comment were declined.

Ms. McRobb, 36, told the Sun that she became "best buddies" with the mayor while in rehab at GreeneStone clinic in Muskoka in May. She told the newspaper that the mayor took to calling her by a nickname – "country pumpkin" – and arranged through his friend Mr. Lisi to lend her his black Cadillac Escalade in May after her own truck was involved in a collision.

Since returning from rehab last week, the mayor has vowed publicly that he's stopped associating with negative influences. Mr. Lisi is a friend and occasional driver of the mayor's who is facing drug and extortion charges in a police investigation also targeting the mayor.

"I now realize that I was blind to the dangers of some of the company I kept," he said in a statement at City Hall last week. "And those associations have ended."

The councillor also called Ms. McRobb's claim that she met him in Muskoka when she was with the mayor untrue. "Never met her," Doug Ford said.

The mayor himself refused to comment on questions about Ms. McRobb on his way into council Thursday morning.