Blueline operators on Tuesday said they would challenge the government notification to phase out the buses.
"We have already talked to the lawyers and are waiting for the notification to come," said Mahender Singh Dahiya, a representative of Blueline bus operators.
"Under the Central Motor Vehicle Rules, the government has to give at least one month's notice to phase out buses. We are hopeful to get a stay from the court," he added.
Several representatives of Blueline bus operators met the transport minister on Tuesday to register their protest against the sudden phase out plan.
"Why is the entire fleet of Blueline buses being phased out despite our continuous service to the city? Only few buses have been involved in accidents," said Delhi Bus Ekta Manch spokesperson Shyam Lal Gola.
"We want the government to let us ply buses on either NCR or inter-state routes or take over our buses under the kilometre scheme."
Meanwhile, Delhi chief minister Sheila Dikshit said increasing number of accidents involving these buses forced the government to take this decision.
Transport minister Arvinder Singh Lovely on Monday announced complete phase out of Blueline buses by December 14. There are about 2,400 Blueline buses in Delhi.
Dikshit, however, has assured that commuters won't face any inconvenience.
"We have RTVs which can run as feeder buses and supplement the DTC fleet. We have also asked the transport department to table its complete plan of bus clusters in the Cabinet next week," Dikshit said.
Lovely later said the government plans to run 24-seater mini buses in the Capital.
"We are working on a policy for mini buses, which will be announced soon," he added.
The Delhi government has already announced its plan to phase out rural transport vehicles (RTVs) from the Capital.
The government plans to give permits to replace RTVs with mini buses, which are more stable and can accommodate more passengers, a senior transport department official said.