However, Najib said Malaysia, Australia and China would hold a tripartite meeting to decide the next move if the Malaysia Airlines plane is not found in the 120,000 sq km area in the southern Indian Ocean that is currently being searched by a team led by Australia.
"If it is not, then Malaysia, Australia and China will hold a tripartite meeting to determine the way forward," Najib said in a statement.
The plane is believed to have ended its journey in the southern Indian Ocean.
The international investigation team probing the missing flight MH370 issued a statement today on the Boeing 777's disappearance, indicating that what happened remains a mystery.
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"To date, the MH370 wreckage has still not been found despite the continuing search in the South Indian Ocean," said the statement, which also offered no new insights into what happened to the plane.
"The disappearance of MH370 was without precedent, and the search has been the most challenging in aviation history. Amidst some of the world's most inhospitable terrain - at depths of up to six kilometres, across underwater mountain ranges, and in the world's fastest currents - the search team has been working tirelessly to find MH370's resting place," Najib added.
"On this most difficult of days, our thoughts and prayers are with the families of those who will never be forgotten," he added.
Indian national KS Narendran, 52, whose wife Chandrika Sharma was on the plane said it was important to find out what happened so that air travel would be safer than what it is today.
"Not knowing is not an easy position to be in," he was quoted as saying by Star newspaper.