Doncaster is now looking for the Old Firm to concentrate their energies on helping take Scottish football forward.
"It is vital, for anyone who has the best interests of Scottish football at heart, that any change benefits the whole of Scottish football - and not just one or two interests within it," he told the SPL's website.
"We need to continue to develop, to be prepared to embrace new possibilities.
"But we need to do so without using self-interest as the only yardstick by which to measure the benefits of any change.
"There is an important job to do - to continue the work that has already been done within the SPL to reinvigorate Scottish football.
"To build commercial revenues for the benefit of all our clubs.
"To drive more money into the game so that our clubs can become more competitive within European competition.
"There is no doubt about it - together we are stronger.
"And having all 12 of our clubs fully focused on their future within Scottish football can only help the SPL carry out that role to in the most effective manner."