Dundee chief executive Scot Gardiner has revealed he was always confident the club would be chosen to replace Rangers in the Scottish Premier League.
The SPL confirmed on Monday that Dundee would be 'Club 12' - a spot left empty in the league following the rejection of newco Rangers into the top flight last week.
Dundee finished second in the First Division last season and were one of two clubs in with the chance of playing in the SPL in the upcoming season.
The alternative was to reprieve Dunfermline, who finished bottom of the SPL last season, but Gardiner told Sky Sports News he always believed Dundee were the preferred option.
"We were always confident that on sporting merits it was an open and shut case - however it is obviously extraordinary circumstances just now and so you could never be sure of anything," he said.
"I received a call just prior to the SPL releasing their confirmation of it. Once again I can assure you that we will be accepting the invitation."
Gardiner is relieved the club can now start to prepare fully for the season as they finally know which league they will be playing in.
"We haven't been able to take a breath yet, let alone a sigh of relief," he added.
"We have kind of been in limbo, certainly for a few weeks and only now can we start to plan properly for the SPL."
Meanwhile, SPL chief executive Neil Doncaster insisted Dundee deserve their place in the top flight under "sporting merit" despite protestations from Dunfermline.
Doncaster said: "The clubs looked at it and overwhelmingly they felt that, on sporting merit, Dundee had the best case and that's why they have received the invite."
Dunfermline have argued that historical precedent favours them with Motherwell staying up in 2003 when First Division champions Falkirk failed to meet stadium requirements.
"That was at a time when those clubs were not compliant with SPL criteria, in which case there was no relegation," Doncaster said.
"Relegation happened last year. Dunfermline were relegated, Ross County were promoted.
"This is an exceptional circumstance when there has been a further vacancy created and in those circumstances it is for the clubs themselves in the SPL to determine who they wish to invite.
"They felt that on sporting merit Dundee were best-placed to get the invitation. There was no formal vote, there was an overwhelming view that Dundee was the right call in terms of sporting fairness."
Dunfermline have vowed to take legal advice on the matter but Doncaster would not be drawn on the prospect, saying: "That's an issue for them."
The SPL has also revealed they will not re-draw the fixture list even with Dundee and neighbours Dundee United now due to play at home on the same weekend on numerous occasions this season.
Doncaster said: "The fixtures will be as they are but there will clearly be an element of flexibility required, both with potentially Rangers and Celtic being at home the same weekend, and Dundee and Dundee United being at home on the same weekend.
"We will work with the police and the clubs to work through those implications.
"TV will dislocate some fixtures anyway, there may be some fixtures dislocated because of European competition. All of those issues we'll have to work through with the clubs, police and the Scottish Football League."