However, the idea was denounced as neither "desirable or viable".
A spokesman for the SPL said: "Rangers and Celtic are massive assets to the SPL and a vital part of the Scottish footballing landscape.
"Both clubs will continue to make an important contribution to the development of our league.
"We have a new chairman and a new chief executive in position, and with that there is a fresh impetus to build upon the work that has already been done in the SPL to reinvigorate Scottish football."
Scottish Football Association chief executive Gordon Smith welcomed what appeared to be an end to the Old Firm's dream of moving south.
He said: "I'm glad the uncertainty has been taken away from the situation.
"It wasn't beneficial having that uncertainty hanging over the game in Scotland.
"Hopefully we can move forward with both clubs focused on being a big part of the Scottish set-up."