The Northern Ireland Football Association (IFA) and Ulster Branch of the Irish Rugby Football Union (IRFU) have reacted cautiously to the GAA decision to endorse a stadium on the Maze prison site.
One problem for soccer and rugby bodies is that the 42,000 capacity may not prove financially viable.
Significantly, IFA president Jim Boyce has said the business plan presented by the British government made a provision for this concern.
"The business plan stated an ability to reduce the stadium capacity by 17,000 when required," said Boyce. "That would mean a 25,000 all-seater stadium for less high-profile events. I believe Northern Ireland needs a modern stadium to attract major teams for international matches. The key question though is 'Is it financially viable?' "
"One immediate problem for the IFA is in 1980 we signed a 108-year lease with Linfield football club for the use of Windsor Park so whatever happens it is up to the IFA to reach a settlement there."
Ulster rugby chief executive Michael Reid was less forthcoming, saying certain issues needed to be ironed out at a meeting next week with British government officials.
