Already promoted, the Tigers secured a first championship success since 1966 courtesy of Saturday's 3-1 home win over Wigan Athletic.
And the East Yorkshire outfit's head coach praised everyone associated with the club - including its supporters - after their immediate bounce-back to English football's second tier was wrapped up.
"I'm very, very proud," McCann said.
"I couldn't be more proud of everyone connected to the football club, particularly the fans because it has been a tough couple of years for them with what happened last season. And, to not see this team this season has been so tough for everyone.
"But I couldn't be prouder of everyone from the owners to the staff who work with us on an every-day level and the players, who have been absolutely magnificent. It's been a massive team effort for us to not only get promoted, but to win the league today.
"It's never about me, honestly, this season was a real collective effort. The hard work that's come from everyone has just been incredible and intense.
"It's a really fitting moment and I'm absolutely delighted."
Around 300 City fans gathered outside the KCOM Stadium to celebrate their team's title success and both McCann and his players greeted them after the full-time whistle.
"It was amazing," the Northern Irishman added.
"It was amazing to see the fans because we haven't seen any for about a year now.
"Probably 30 or 40 fans came to the training ground last week but to see 200 or 300 out there celebrating with the players it was magnificent for everybody.
"We just can't wait for them to come back and see this group of players because, for me, we've got a group who will give everything for this football club."