Louise Evans from business advisors Grant Thornton says promotion could be worth up to £150m for the club and will have knock-on benefits for the city and Wales.
More top news
Tree pollen levels are easing off now! But beware - grass pollen is just becoming airborne and levels will rise during settled spells.
Northern areas will see a few showers this afternoon - but there'll be plenty of warm sunhine too!
Wales is facing a recruitment shortage for secondary school teachers. At the start of the year a third of training places were not filled.