Tottenham chairman Daniel Levy insists they won't rush any move away from White Hart Lane.
"I am determined that we shall work towards a successful outcome and a project of this nature and importance cannot be hurried," Levy said.
"On a point of clarity, we have taken no decision on whether or not to expand White Hart Lane and we continue to review and keep our options open."
Spurs did not want a June deadline to hamper any negotiations and the new possibilities mean the deliberations will take longer.
The value of the land in the Tottenham area is also a problem that has led to the decision taking longer than first expected.
"The difficulties with seeking a solution to our need for increased capacity are significant," Levy added.
"They include low residual land values within the Tottenham area which in turn makes enabling development less feasible, along with a limited number of suitable alternative sites within London, all of which require land assembly."