A point at home to Stoke kept Ian Holloway's side out of the bottom three courtesy of their goal difference, which is just one better than Wigan's.
Evatt believes one more win, which would lift them to 38 points, will be enough to secure a second season in the top flight but that it has to come in their next two matches as they head to Old Trafford on the final day - where Manchester United have dropped just two points all season.
"Nobody knows how many points we will need but I believe three more will be enough," he said.
"We will be going for them on Saturday at Tottenham. If we don't get them there, we will be looking at a massive match against Bolton at home.
"We have to win that one really because we don't want to be going to Old Trafford needing a win."
Source: PA
