The company confirmed that the two Croatians and the Montenegrin, working on an oil rig owned by HydroDive in Port Harcourt, were kidnapped on Sunday evening.
"HydroDive is cooperating with Nigerian authorities towards securing the safe release of these individuals," the message said.
The kidnapping occurred around 10 p.m. just outside the shore base facility where the HydroDive vessels were docked, the company said.
"To our knowledge no one was hurt in the actual kidnapping incident," the company said in response to Hina's inquiries, adding that it had not been established yet whether the kidnappers were aligned with any militant groups from the Niger Delta or whether this was the action of criminals.
Foreign news agencies reported on Monday that armed attackers had kidnapped three oil workers in the Nigerian city of Port Harcourt on Sunday.
The Croatian Foreign Ministry on Monday published the names of the hostages. Later in the day, the kidnappers demanded that HydroDive set up a telephone line through which company officials could communicate with their kidnapped workers, the Foreign Ministry said.
According to information from the ministry, the kidnapped workers are Croatians Renato Garma and Mate Lusa and Montenegrin Milan Smolovic.
People working for foreign oil companies in Nigeria, the world's sixth largest oil producer, are frequently targeted by armed groups who use kidnapping as a means to achieve political goals, as well as to seek ransom.