The 26-year-old scored the only goal of the game at the end of the first half and only a good performance from keeper Devis Vasquez saved the home side from suffering a heavier defeat.
McKenna said: “I loved the game, the performance and of course the result.
“I thought this was a big one for us and the season, not having managed to win here in the last couple of visits.
“It’s a barometer for us as a team.
“I thought it was an excellent performance in the first half. Coming back from international duty, I thought we imposed ourselves on the game and dominate.
“We created some big opportunities, pressed well and didn’t give them anything. It was an excellent performance.
“Probably after 65 minutes, we should have been 2-0 or 3-0 up.
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