Neil Harris says it was one point gained rather than two points dropped after his side drew 2-2 with Queens Park Rangers at Loftus Road.
Conor McLaughlin and Jed Wallace gave Millwall a two-goal advantage, but Massimo Luongo and a late Matt Smith strike earned QPR a point.
Millwall striker Lee Gregory was harshly sent off four minutes before the interval, and it was a turning point in the game that left Harris feeling aggrieved.
He said: “It is a good point earned. I said to my players I am proud of their character, proud of the performance. I thought for 40 minutes, we were excellent. Eleven versus 11, what a good Millwall performance.
McLaughlin’s stunner was Millwall’s first away league goal of the season and Harris thought his side could have gone further ahead before Gregory was dismissed.
He continued: “We got our noses in front and could have had three or four more. Then, we get a crazy decision on the red card. At the time and having seen it back and having spoken to my players, I could not believe it was a red card.
"It completely changed the game and we will be appealing.
“To get two-nil in front was a real bonus. It gave us a real opportunity to hang on in there. I thought we would see it out but it was not meant to be.
"But, overall, I am really pleased. There are a number of positives.”
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