Graham, 24, received special praise from his boss after playing the whole game despite suffering from a nose injury.
"Obviously he had a nasty knock and he took the ball to the face today, which is not very nice when you've got a nose problem," said Mackay.
"I have to say I thought he was fantastic today. He ran into the channels so many times, he caused them no end of discomfort and thoroughly deserved to score."
Meanwhile the club's under-15s have arrived in Northern Ireland to play in the Milk Cup tournament with 23 other sides.
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