The former Celtic star believes Rangers should never have been demoted to the bottom division.
Rangers will be back playing in the top-flight of Scottish football from next season after winning the Scottish Championship.
Mark Warburton has led the club brilliantly this season as they finally leapt the final hurdle to get back to the Scottish Premiership after the Ibrox side were demoted to the bottom rung of the Scottish football ladder in 2012 following massive financial problems.
One man who thinks that the demotion of Rangers was a mistake from the start is former Celtic midfielder Paul Lambert.
“I think it was the worst decision ever to demote Rangers three leagues. I think whoever made that decision needs their head looking at.
“It was detrimental to Glasgow, detrimental to Scotland, detrimental for the national team. Everything went against the grain when they got demoted.
“I think them coming up, 100 per cent will be brilliant because Celtic will raise their game as well, no doubt about it.”
Rangers get the chance to win a treble this weekend if they can defeat Hibernian at Hampden Park and next season they will be hoping to push Celtic all the way in the race for the Scottish Premiership title.
Celtic fans should, weirdly, be hoping that is the case. The Bhoys have become complacent as Glasgow’s undisputed number one for the past four years and Rangers heading back to the top flight is, as Lambert suggested, great for both Old Firm sides.