Chairman of the Port of Tallinn's supervisory board Neinar Seli told the Baltic News Service that "work on the tender had not proceeded according to plan."
Seli said the port would not be naming a winner for the construction tender because "the supervisory board first wanted to discuss the port's strategy for the next few years."
This is the second time that the Port of Tallinn has postponed announcing a winner for an extension of Muuga port to accommodate a container terminal.
Seli said a final decision would be reached next month.
The new container terminal was slated to add two kilometres of wharves with first phase development allowing the terminal to handle some one million TEUs per year.
The project appeared to have the backing of the Chinese port of Ningbo with a recent report saying Chinese officials had signed a letter of intent to invest in a container terminal.
The Baltic News Service has said that the port of Tallinn was hoping a major Chinese goods distribution center in Muuga would boost throughput following a difficult year in 2007 when Russia cut its exports through Estonia.
Official data from the Port of Tallinn showed that cargo throughput for March was 3 million tonnes, which is a 25% drop from the 4 million tonnes it handled in March last year.