SEOUL (Reuters) - South Korea's Park Tae Hwan got down on his knees and begged for the chance to compete at the Rio Games on Monday as the Korean Olympic Committee (KOC) shows no signs of lifting the additional doping sanctions it has imposed on the swimmer.

Park was banned for 18 months by governing body Fina after testing positive for testosterone ahead of the 2014 Asian Games.

While the ban expired in March, he must now wait three more years before he can be considered for selection under KOC rules.

Despite the ban, Park competed at last week's national trials and won the 100m, 200m, 400m and 1,500m freestyle events.

He swam the fourth fastest time of the year in winning the 400m, clocking 3 min 44.26sec.

The 26-year-old, who won gold in the 400m freestyle at the 2008 Beijing Games to become the first Korean to win an Olympic swimming medal, told a news conference at Incheon City Hall on Monday he wanted the chance to make amends for his mistake.

"As a swimmer, I feel it is most important to speak through records and results in the pool," he added. "I hope that I am given a chance so that I can deliver a good performance for the people and contribute to the nation."