Line No. 9 of the rail network in Brazil's largest city will be extended 4.5km, with two new stations.
The move would allow President Temer to win political support to block corruption allegations, a newspaper reports.
Peru's biggest infrastructure project, line No. 2 of the Lima metro, got a shot in the arm after the government approved the studies.
The government recently announced that it is in the process of rescinding the US$399 contract awarded to Obebrecht to expand highway CA-02.
Construction works on the project are scheduled to be concluded in 24 months.
JSL said it agreed to pay some US$30mn for the company.
The government of the Brazilian state will invest nearly US$8mn in the works.