"We recently met with the justice minister and Archbishop Gintaras Grušas and made a break in the government discussion on the issue. They presented certain proposals," the prime minister told BNS on Tuesday.
The bill has attracted criticism for excluding same-sex couples from the possibility to register civil partnership.
Butkevičius refused to elaborate on the proposals but his advisor on religious issues Julius Ratkus said on Monday final adjustments were being made and the bill would be put before the Cabinet next week.
"These proposals should be discussed with legal experts from both sides, and the bill should be presented to the government," he said.
The Ministry of Justice has proposed to the government to legalize partnerships between men and women only.
Meanwhile nine Liberal and Social Democratic lawmakers registered a bill in late March, allowing registered partnerships between both opposite-sex and same-sex couples.