Walter Smith has refuted suggestions the Old Firm would struggle in the Barclays Premier League.
In fact, the Ibrox boss is confident Rangers and Celtic would eventually challenge the top four clubs in England if given time to establish themselves.
West Brom boss Tony Mowbray this week questioned the Glasgow giants’ ability to make an impression if invited to join a new-look top-flight south of the border.
Smith said: "It’s all hypothetical at the moment but there would be a situation where the level of finance which would be available to Rangers and Celtic would be far greater than the majority of the teams in the Premier League if you take into account the commercial aspects.
"Remember, it wouldn’t happen overnight. If they were lucky enough to be invited into the Premier League then it would take a good number of years to build up. But there is no way Rangers and Celtic would be fighting relegation in the Premier League.
"Rangers and Celtic are bigger than the majority of teams in England, never mind anywhere else. If you look at Manchester United, you would say that — yes — there is hardly a team in the world who could compete against them on or off the field.
"But Rangers and Celtic, given a few years, would not be fighting relegation — they would be adding to England’s top four."
The possibility of revamping the Premier League may be discussed at their next meeting in the summer. But Smith does not hold much hope of the Old Firm being invited to join a new set-up, claiming clubs south of the border would be wary of their potential for success. He added: "I don’t think the English teams would want Rangers and Celtic there for the obvious reasons and that obvious reason is the situation that they would not be fighting relegation."
Meanwhile, Smith hopes Kris Boyd can add to his 100 goals for Rangers between now and the end of the season to bolster their hopes of claiming a domestic double. The Ibrox club accepted an offer from Birmingham for the striker in January but the move collapsed over personal terms and Smith is now keen to make the most of the prolific forward.
Asked whether Boyd’s recent success would make it even more difficult to justify a sale in the summer, the Rangers boss said: "We all know the reasons why that was the case in January; it wasn’t something the club wanted to do.
"He is here and he is scoring goals. And, as we go into this period of the season, hopefully his goals can help us win the games necessary between now and the end of the season."
Smith also expects Charlie Adam to be back at Ibrox this summer despite overtures from Blackpool about making his loan spell a permanent move.
"Once the Championship finishes this weekend, he will be back with us," said Smith. "So, like every other player on the staff, he will be with us next season unless something else comes along. He seems to have played very well. We’ve had people down watching him on a couple of occasions and he has played very well."