Harry Redknapp’s men secured a 0-0 draw with the Premier League champions after being dumped out of the FA Cup at the fourth round stage 4-2 by MK Dons.
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The result brought into question the spirit at Loftus Road, but the 35-year-old believes that the point against City has proved that he and his team-mates remain capable of beating the drop.
“When you lose 4-2, you have to reply in the right manner — we showed that against City,” Derry told the Sun.
“We proved a point to a lot of people and showed we are all in this together.
“Slowly but surely we are closing the gap.
“That was a huge point for us. We now have to take that into the Norwich game on Saturday.
“It is no good taking a point there and then dropping three. We must progress again.”