Cardiff City are already assured of promotion to the Premier League following one of the most celebrated goalless draws in their history.
This afternoon they could also secure the Championship title when they face Burnley away.
The game kicks off at 12:45 - you can follow the action here.
Cardiff City star Craig Bellamy said: "There should hopefully be no limit to what we can achieve from now on."
"There is no other league like the Premier League. It's going to let us be worldwide. It's going to allow us as a club to excel and allow us to really grow."
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.
Craig Bellamy, who captained Cardiff City last night as they drew 0-0 with Charlton, said securing promotion to the Premier League his hometown club was his "best" achievement in football.
The Wales international and former Liverpool and Manchester City forward said, when the full-time whistle went, he dropped to his knees with exhaustion and "utter relief".
"I'm just so grateful to have played a small part at this club in such a memorable stage" [in Cardiff's history], he said.
Cardiff City’s promotion to the Premiership is fantastic news. It is the result of much hard work and dedication by the team, and is well deserved.
– Graham Morgan, director of the South Wales Chamber of Commerce
Swansea City’s first season in the Premiership brought an estimated £58m into Wales, creating around 420 new jobs, and it is essential that Cardiff starts making the most of this opportunity right from the off.
Cardiff City Manager Malky Mackay said the occasion belonged to the staff at the club, the directors, and the people of Cardiff.
"I hope that was a little way to repaying the backing that they have given me."
Cardiff City's Malaysian owner Vincent Tan described himself as "very happy" after the club secured promotion to the Premier League.
"This is great, I am very happy", he told Sky Sports News.
"Malky [Mackay] is a fantastic manager. We have a great working relationship."
Tan controversially decided to change the colour of the club's shirts from blue to red last summer.
It was designed to make Cardiff more marketable in Asia - but red is also a lucky colour in China.
"Lucky red, you know, lucky red", Tan added.
Cardiff Council Leader Cllr Heather Joyce is praising the Bluebirds :
"This is a fantastic achievement by the club and I am so delighted that Cardiff City has realised its ambition and made it into the Premier League."
"I would like to pay tribute to everyone at the club - the team, the manager, the staff and the fans - for all contributing to this wonderful achievement, this truly is a historic and exciting day."