The current strike, which began Monday, has prevented more than 4,000 containers from being unloaded from cargo ships docked at the port.

Trade unions fear businesses could experience shortages during the busy Christmas season if the strike continues, saying they expected more than 60,000 containers to arrive at Piraeus port by mid- December.

Unions are threatening further action unless the contract is annulled.

The deal between the Greek government and the Chinese port operating company was expected to go into effect on October 1, but a strike by dock workers, who said they feared COSCO would cut jobs, delayed the company from taking over until the start of November.

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The work stoppage is costing Greece nearly $4.5 million a day.