Justice I S Mehta extended Singh's parole, which was to expire tomorrow, after Delhi police sought time to verify the grounds on which the relief was sought.
"In the meanwhile, parole is extended on same terms and conditions till June 19, 2015," the court said.
Singh in his plea has said that his wife was pregnant and needs to undergo tests between June 11 to June 13 and placed on record her medical reports.
Singh, a law student in Delhi University, had raped and murdered Mattoo, a third-year law student, in January 1996.
More From This Section
He was acquitted by the trial court on December 3, 1999, but the Delhi High Court had on October 27, 2006 reversed that decision, holding him guilty of rape and murder.
The high court had also awarded death penalty to him in the case. Singh, son of a former senior IPS officer, had challenged his conviction and death sentence awarded by the high court.