It looked like it would be all three points for the North-East side with Rhys Oates's goal in the first-half being the difference between the two sides, writes Tom Feaheny.
But Tommy Wright with 95 minutes on the clock got the goal that meant the sides drew.
“We have been on the right side of results with late goals but -it went against us," Harrison said to the club's website.
"It is frustrating but we have not lost and we’ve picked up another valuable point.
“Sutton are a tough team to play against; they have lots of experience and aggression through the spine of their team but the lads stood up to it really well.
Harrison wants this late goal to be used as added motivation for their game against Tranmere Rovers on Tuesday.
“We will be men about it, we won’t feel sorry for ourselves so we’ll dust ourselves down and make sure we’re ready for Tuesday.”
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