Northampton chief executive Allan Robson says there are no immediate plans to play more games at Stadium MK.
Saints face Munster in a sell-out Heineken Cup clash there on Saturday.
Robson told BBC Look East: "We will be able to allow about 10,000 extra Saints fans to see the Munster game by holding it at Stadium MK.
"It's not a matter of how many games do we want at Stadium MK. Opportunities arise from time but we have no further plans to go there."
Saints announced expansion plans for their Franklin's Gardens home in September, which would increase the capacity to 15,500.
European Club Rugby rules state that matches in the later rounds of the Heineken Cup must be held at stadiums that can hold at least 15,000 people.
But Saturday's clash with Munster will be the first time Saints will have chosen to play a home game away from the Gardens without the influence of rugby's rule makers.
"We'll look at things as and when they arise," said Robson.
"If things point to that being a solution to a problem, then that's something we'll look at."