The countries agreed to extend the deadline for three months to July 31 after talks on the scheme, known as the Rapid Transit System (RTS) Link, were hit by curbs on movement to stem the coronavirus, Malaysia's Transport Minister Wee Ka Siong said in a statement.
In a separate statement, Singapore's transport ministry said it hoped to wrap up discussions with Malaysia soon, adding that it would be the final extension.
The RTS Link project was suspended last year after Malaysia's then-government, which came into power in 2018, pledged to tighten finances and review major deals.
The project cost was cut by a third from about 4.93 billion ringgit (US$1.15 billion) to 3.16 billion ringgit (US$736.08 million) after discussions between both countries, then-premier Mahathir Mohamad said in October.
In March a new Malaysian government led by Prime Minister Muhyiddin Yassin was sworn in after Mahathir's sudden resignation. - Reuters