Walker worries whether Rangers have the financial muscle to compete with Celtic.
Former Celtic striker Andy Walker has expressed his concerns over whether Rangers will be able to compete with his old side even if they win promotion.
The retired forward told Sky Sports News HQ's review of 2015 that while he expects the Gers to win promotion from the Scottish Championship, what they will be able to do once in the top flight is another matter.
He says that he has doubts over new supremo Dave King and the investment which can be made to help elevate the standard of the Rangers squad to be able to win trophies.
Walker commented: "Nothing less than the title will do for Rangers. In all honesty I think they are fair bit behind Celtic.
“Celtic have got a bit of financial muscle we are yet to see Rangers come up with. I think Dave King has talked a good game since taking over but I don’t know if he has delivered as yet and Rangers certainly need players to cope with the step up they’ll have on a weekly basis if, as we all suspect, they come up at the end of the season."
Walker's views are fair comment, Rangers do have it all to prove, and must actually earn promotion first before his point can really be put to the test.
But even then, expectations must be realistic for Mark Warburton's side, which has relied upon loan players and players from the lower divisions in England to get it to the level it is currently playing at.
Being back in the top flight will unlock more television revenue, but patience must be urged before they can win the title again, and should not judge themselves upon a failure to do so in their first season in the top flight.