"The issue is planned to be discussed tomorrow. It will be discussed tomorrow," Parliamentary Affairs Minister Kamal Nath told the House.
The assurance came when AIADMK leader M Thambidurai raised the matter during Zero Hour.
Tamil parties are up in arms after fresh allegations about human rights violations against ethnic Tamils by Sri Lankan forces, in the wake of charges that 12-year-old son of slain LTTE Chief V Prabhakaran was shot dead in cold blood.
In an attempt to mount pressure on the government, MPs of DMK, a major partner of the ruling UPA, yesterday wore black shirt while attending House proceedings.
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They also held a protest inside the Parliament House complex on the issue.
Congress MPs from Tamil Nadu have already told party Vice President Rahul Gandhi that India should take a stern stand against Sri Lanka at the upcoming UN meet on Tamils issue as it was crucial for the party's future in the state.
India has already said there should be accountability for such issues but has remained evasive on the position it will take at the UN on a resolution against that country.