Portadown boss Niall Currie lamented “a couple of minutes of madness” early in the second half which cost his side as they were beaten 2-1 by Linfield at Windsor Park.
Two goals soon after half-time from substitute Chris McKee helped the Blues edge the Ports, with Paul McElroy pulling a goal back late on.
And Currie was frustrated with the manner of the goals after holding their own in the first half against David Healy’s side.
“A couple of minutes of madness, second half we switched off for two minutes didn’t track runners and it has hurt us today,” he told BBC Sport NI.
“First half we were really solid, there was nothing in the game and other than those two minutes we were a real match for Linfield.”
Despite his disappointment that they were unable to salvage a point, Currie praised the approach from his players.
“I’m frustrated but I’m not dejected in any way and I’m proud of the players. We left everything out there and we went out on our shield.”