Stiliyan Petrov said on the Alan Brazil Sports Breakfast show on talkSPORT on Monday morning that Rangers will push Glasgow rivals Celtic next season.
"Celtic need Rangers," said former Celtic midfielder Petrov. "We all know that.. With Rangers coming up now, Celtic will be pushed again."
Celtic are playing in the Scottish Premiership at the moment, while Rangers are currently in the Scottish Championship.
The Bhoys are firm favourites to win the Scottish top-flight title, and the Gers are expected to clinch the Championship crown and gain automatic promotion to the Premiership at the end of the season.
Celtic and Rangers are the two biggest clubs of Scotland, and them playing in the same division next season will certainly be a huge boost to Scottish football.
However, it should not be taken for granted that the Gers will be able to challenge Celtic next season.
If Rangers get promoted, then next season will be all about consolidating their place in the Scottish Premiership rather than challenging for the league title.