"We've said we need to go on a run now until the end of the season unbeaten and that will get us into the play-offs," said Grayson after the draw at Bristol Rovers on Saturday.
"We are all hugely disappointed and frustrated. Conceding so late it feels like a defeat. We created the chances but weren't ruthless enough and didn't kill the game off.
"We had a three against one at the back at one point and you have to score in those situations. That's the killer instinct that get steams promoted."