Kevin McStay believes that Derry are now genuine Ulster contenders following their comprehensive destruction of All-Ireland champions Tyrone in Omagh.
"The manner of it is what's significant in that it’s from the gun to the finish line," he said of Rory Gallagher’s side’s triumph.
"It was consistent application of an attitude and a plan that I’d say they’d long contemplated back home in Derry.
"They rode it out with real efficiency and commitment to every aspect, they were tactically perfect.
"They never got ahead of that, in other words even when they got the gap, they still ran the two minutes out of their shot clock if that’s what they wanted to do, if they felt that was the right thing to do.
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"I thought it was superb. Their commitment to that championship game was complete.
"This was the All-Ireland for them. That’s always the problem for the champion team when you’re being chased, this game becomes that All-Ireland for the opposition."
McStay added that the "implosion" of Tyrone in front of their own fans at Healy Park, including the dismissals of Brian Kennedy and Conor McKenna, was a worrying development for a team who no longer have any wiggle room left in their hopes of becoming the first Red Hand side to go back-to-back in the race for Sam Maguire.
"What we don't fully realise down south is the nature of this rivalry," he said of the neighbourly clash.
"I won’t say it’s quite Galway-Mayo or Kerry-Cork perhaps, but it’s up there. It’s well up there. There’d be no love lost between them.
"Derry would see this as the match of the year for them and it was, I suppose, kind of astonishing really – not that they won it, we’ve spoken about that, I don’t think that’s astonishing. It was a surprise, an upset, a mild surprise, I don’t know which one you want.
"I wouldn’t have tipped them now in fairness, I wouldn’t have gone for them for the win, but I did see it being very close.
"Flip the coin, the absolute implosion of the champions, it was just amazing to see. Their attitude was so off it was shocking. Then the discipline started to fall apart.
"They never put a hand on them really. A compelling victory for Derry and of course it puts them in the seat for Ulster champions but they have some fence to jump in the next round [Monaghan] and if they were to get to the final, they have another fence [Donegal or Cavan].
"It would probably take two more performances like yesterday probably to win it. Are they capable of doing that? They most likely are."