American tennis player Alex Bogomolov Jr has been suspended after testing positive for a banned substance at this year's Australian Open.

In a statement on its website, the ITF said that 22-year-old Bogomolov gave a sample on January 13 which contained salbutamol, although it accepted his explanation that he took the drug to treat asthma.

"An independent Tribunal has ruled that Alex Bogomolov Jr has been found to have committed a doping offence under the ITF's Tennis Anti-Doping Programme 2005," the ITF said.

"The Tribunal found that there had been no intent to enhance performance by the taking of salbutamol (a specified substance under the World Anti-Doping Code), so that the otherwise mandatory two-year ban did not apply.

"However, the player was found to be at fault for failing to take personal responsibility for ensuring that he had a valid TUE (Therapeutic Use Exemption) to cover the use of salbutamol."

Bogomolov, who lost in the first round of qualifying for the Australian Open and is ranked a lowly 190 in the world, is suspended for one-and-a-half months, starting from September 26.

He must also forfeit prize money and ranking points earned at the Australian Open and events up to and including the Mexico City Challenger which ended April 10.

He can return to competition on November 10.