No-one is surprised, and frankly Mackay is probably better off out of it. The Cardiff fans, on the otherhand, will no doubt mourn the man who got the club to a Championship play-off final, a League Cup final and into the Premier League during his two-and-a-half years in charge.
West Ham, Palace, Sunderland and all the other teams deep in relegation trouble will doubtless be a bit happier tonight, as there has to be a real possibility that Cardiff will now go into meltdown, as many will wonder whether the club will be able to attract a manager half as good as the one just shown the door.
The favourites to take over at Cardiff ? Sven, Ole, Zola, Ian Holloway, Steve Clarke ? Dream on, Cardiff fans (although Sven might come if the money was right). It's more likely, however, that Tan already has his man in mind - a ball boy ? Club mascot ? The bloke behind the bar ?
But maybe we do Mr Tan a disservice. After all, Southampton fans were equally as angry when the club sacked Nigel Atkins almost a year ago. And look at Southampton and the new manager now. So it's just possible that Tan is a visionary - and that he can see things we mere mortals can't (after all, Tan is a billionaire).
It's equally possible, of course, that Tan really doesn't have a clue. In fact, he is just a man used to getting his own way. Like the Blackburn Rovers owners, the Venky's, who surely have learned their lesson the hard (and expensive) way.
Not long after taking over Blackburn in 2010, the Indian poultry people sacked manager Sam Allardyce when the club were in 13th place in the Premier League. Avoiding relegation that year (just) under new manager (ex-first team coach) Steve Kean, Blackburn went down the following season. Kean was sacked in September 2012, when the club were in 3rd place in the Championship.
Kean's replacement, Henning Berg, lasted 57 days, and his successor, Michael Appleton just 10 days longer. Current manager Gary Bowyer has been in charge since May, and Blackburn are currently in 11th place in the Championship, 1 point nearer the top of the league than they are the drop zone. Oh what Blackburn Rovers fans would give to have had a Malky Mackay over the last 2/3 years.
Only time will tell, of course, if Tan has called it right with Mackay. But at the moment, there are lots of doubters.
And as for Malky ? It's just a matter of time before a Premier League club (WBA ?) or top Championship side (Bolton ?) comes calling, and off he goes again.
Only in football!
image: © joncandy