"The operation is continuing in the right place" in the southern part of the ocean," said Martin Dolan, who heads Australia's search efforts.
The wreckage, said to be a wing part, is to be flown to France for analysis, reported BBC.
The Malaysia Airlines flight - a Boeing 777 flying from Kuala Lumpur to Beijing - vanished on March 8, 2014. There were 239 passengers and crew on board.
According to aviation experts, debris, found on Wednesday in France's Reunion island has resemblance to flaperon - a moving part of the wing surface - from a Boeing 777.
"There is no other recorded case of a flaperon being lost from a Boeing 777," Dolan said.
"We are confident we have the quality of the search to cover that area and find the missing aircraft," he added.
Aircraft debris found in the Indian Ocean will be shipped to France for investigation, said Malaysian Prime Minister Najib Razak said on Thursday. Experts are likely to examine the debris in next week.