Pakistan has agreed to accept the delegation, spokesman Aimal Faizi told reporters, adding that it could leave as early as Tuesday.
Rabbani was assassinated by a turban bomber at his Kabul home in September in a move which stalled efforts to talk peace with the Taliban in Afghanistan.
Afghan officials say the killing was planned in Pakistan and carried out by a Pakistani suicide bomber. They have also previously accused Pakistan of refusing to cooperate in the probe.
But at a conference in Istanbul earlier this month, the two sides agreed to cooperate on an investigation into the killing.
"The government of Afghanistan, in order to further investigate the assassination of professor Burhanuddin Rabbani... will soon send a delegation to Pakistan. Pakistan has accepted to receive the delegation," Faizi said.
"After the pressures that Afghanistan and Turkey put on Pakistan at the Istanbul conference, Pakistan finally agreed to accept our delegation."
The delegation will feature officials from Afghanistan's defence and interior ministries, plus its intelligence service.
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I agree that the murder of an innocent man is a tragedy especially if that man was all for peace. But the amount of Pakistanis that have died because of Afghani terrorist groups, are never 'investigated' as such. @Cautious What the world suspects means nada. The world once believed that Iraq had womd, you saw that belief go down the drain. The world believes what a few people want it to believe.
Nice gesture but to what end? Most of the World suspects ISI involvement and we all know that no one in Pakistan is going to help investigate that.
Its good news to hear that Pakistan ultimately accept to investigate in the murder of peace envoy assassination Rabani. This will really invoke the trust between both partners and will give a chance to straighten the relations between these two historical strategic neighbors. Obviously public of both countries will welcome to this step taken by their governments. This also reflects that there are no more places for terrorists in these two neighboring countries.