The Latics were heading towards a goalless draw in the League One clash at Meadow Lane until Alan Sheehan’s 89th-minute strike snatched the points for County.
Furman, who returned to the side after two-and-a-half months out, said: “It was great to be back and I had that buzz back which I haven’t had for a while.
“Now I’m a bit deflated with that last-minute goal but everyone could see the desire we had to get something from the game.
“The gaffer keeps talking about fine margins and we’ve been inches away from a point or three points so many times.
“We haven’t managed to find that level of consistency yet and until we do, we won’t be able to challenge at the top of the table.”