The statement came in response to Friday's announcement by pilots' union Vereinigung Cockpit (VC) of a three-day strike starting on Monday after talks failed, Reuters reported.
The union wants Eurowings to lighten pilots' workloads by, for example, increasing their rest periods.
"The union's position eats away at the prospects of Eurowings Germany," the airline said.
A one-day strike earlier this month saw Eurowings operate at half capacity, affecting around 30,000 passengers.