The Nigerian government held an emergency cabinet meeting on Wednesday, the second day of mass protests, after one person killed and more injured.
It resolved to provide hundreds of buses, among other resolutions, to cushion the impact of the subsidy, but, it did not back down from its decision to remove the subsidy.
The unions rejected this and called for an "indefinite" national strike and mass demonstrations to shut down sectors, such as oil production starting, on Monday if the government did not restore the fuel subsidy.
"If the government fails to do so, they direct that indefinite general strikes, mass rallies and street protests be held across the country with the first on Monday, 9th January, 2012," the National Labour Congress and Trades Union Congress said in a joint statement released on Wednesday.
"All offices, oil production centres, air and sea ports, fuel stations, markets, banks, among others will be shut down."