But local leaders have warned against the use of force on the grounds it would hurt civilians.
Special forces are due this weekend to begin training for a possible operation against the Niger Delta Avengers (NDA), which if carried out would be the first in the oil-rich region since 2009.
"The aim of the exercise is to practise our special forces and other units of the Nigerian Army in amphibious and internal security operations in riverine environments," read an army statement.
In the latest of a string of attacks against oil installations, the NDA says it was behind the Sunday sabotage of a gas pipeline owned by the state-run oil company in the southern Akwa Ibom state.
Since February, the group has also targeted infrastructure owned by oil majors Shell, Chevron, Exxon and Eni, whom it blames for widespread poverty and underdevelopment.
NDA's actions have significantly reduced oil production at a time Nigeria is struggling with low global crude prices which have hammered government revenues, weakening the naira and pushing up inflation to near 11-year highs.
Usman urged Nigerians not to panic if they noticed unusual movement of large number of troops, heavy weapons and military equipment in the area.
Nigeria has not conducted major military operations in the south since 2009, when an amnesty ended a year-long crackdown against the armed Movement for the Emancipation of the Niger Delta (MEND).
MEND's activities had slashed Nigeria's oil output by two thirds.
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