"These developments cannot be fully offset by cost saving measures that have already been initiated," it said on Friday.

Its stock plummeted 18 percent to 29.44 euros, their lowest level in more than three months.

It said it now saw 2018 earnings before interest, tax, depreciation and amortisation (EBITDA) coming to between 900 million and 1.15 billion euros ($1.05-1.34 billion), compared with 1.05 billion in 2017.

It had previously said it saw EBITDA rising this year.

($1 = 0.8581 euros)

(Reporting by Maria Sheahan, editing by Louise Heavens)