FIFA have admitted that Celtic and Rangers could make the move to the Premier League in the near future if all the parties involved agree to the decision.
The “legal” position of such a move for Scotland's Old Firm has been in question since both clubs re-iterated their desire to leave the SPL last week.
Now a spokesman for the Federation Internationale de Football Association has confirmed that such a move would be possible if the appetite was evident from the clubs and the League itself.
A FIFA spokesman said: "We need look no further than here in Switzerland where a team from Liechtenstein play in the national league set-up.
"So it is theoretically possible Celtic and Rangers could play in England."
Fifa has long championed the standardisation of top leagues, wanting to see 18 clubs in the top league in each member country – which is what the changes proposed by Bolton Wanderers chairman Phil Gartside would create.
Such a move would benefit FIFA by making the planning of international matches simpler.
Sepp Blatter had lobbied for a reduction to be made in 2007 but the move was resisted by member clubs. The resizing of the EPL could be a selling point to those in FIFA who otherwise might otherwise oppose opening the floodgates for other teams to demand moves.
Although there are some teams who have held membership of other leagues, notably Berwick Rangers, an English-based club who play in Scotland, FIFA have not given permission for such a move in recent years.