Dundee found themselves two goals behind in the first ten minutes against Inverness and despite pressing to get back into the game, they never troubled the Caley rear-guard as often as the manager would have liked.
He said: “I’m disappointed. We lost two really sloppy goals, early goals as well. It rattled us.
“I didn’t see that coming. I’ve set standards and we’ve come up short. That group have proved to me that they were worth their position in the Premiership but they didn’t show it here.
“Nobody through there is celebrating with champagne or beer, thinking it’s good we’re safe.
“And we aren’t taking our eye off the ball.”
Dundee take on Hamilton this Saturday in the last game of the season. A game which could potentially see the Accies relegated if Dundee were able to either draw or beat them and if Inverness win in their match.
McCann has also showed his desire to get back to winning ways and despite having nothing to play for, he doesn’t want that to be an excuse.
“We’ve got a very difficult game against Hamilton now. I don’t care if we’re safe. Nobody is on their holidays here.”