"Unbelievable, what a save that is," Derry said on Sky Sports 2. "I suppose that's why we've got him in the team but it's about 11 players out there today. It was an unbelievable effort.
"This time last year we were putting in results against the big four or five and now we've beaten Chelsea and got a point here so it's great for us.
"Our season has been the best part of disastrous until a few weeks ago, but we've got the win away at Chelsea and then a draw with Tottenham. We've got Man City coming so we've got to really build on this and get out of trouble."