Some 1,400 UK offshore workers are preparing to strike "within weeks at sites operated by major oil and gas companies, the Unite union said on Monday.

Operators including BP, CNRI, EnQuest , Harbour, Ithaca, Shell, and Total will be affected, Unite said in a news release.

The planned action includes offshore workers at Bilfinger UK Limited, Stork construction workers, those at Petrofac Facilities Management Limited on the FPF1 platform and Wood Group UK workers on TAQA platforms.

Several Sparrows Offshore Services workers recently voted to strike at dozens of platforms on the UK continental shelf including those operated by BP and Shell. (Reporting by Seher Dareen in Bengaluru; editing by Louise Heavens and Jason Neely)