However, local media said the restart could still be delayed by legal action from environmental groups as the remaining stretch of the pipeline runs through the edge of a conservation area for birds.
Construction of the Baltic Sea pipeline, which is reported to be more than 90% complete, was suspended last year after the United States imposed sanctions, a decision criticized by both Germany and the European Union.
The US said the pipeline would threaten the EU’s security by increasing the bloc’s dependence on Russia, while Berlin has insisted it will create a direct and secure energy supply.
Work on the Danish island of Bornholm, where two Swiss laying vessels were operating, stopped as a result of the threat of penalties.
The Russian-led company behind the project later insisted it would continue the project alone, and on Friday, its Fortuna pipe-laying vessel arrived in the Baltic Sea off Rostock.
Danish authorities said Friday they were due to carry out preparatory work and tests with the help of the ship.
Earlier this month, US lawmakers agreed to extend sanctions on Nord Stream 2, just as Moscow vowed to restart construction.
The Gazprom-led consortium behind Nord Stream 2 says 2,300 kilometers of the double pipeline are now complete. A further 150 kilometers must be finished, most of which are in Danish waters.