Scunthorpe are the only side that can catch Shrewsbury now, but they are six points behind with a goal difference of -19 compared to Salop.
"With the way the results went on Tuesday it would have to be an absolute disaster for us to go down," Turner told the club's official website. "There would have to be a 19-goal change in goal difference.
"We're six points clear of Scunthorpe who have two games left and it's only goal difference now that can change it so we're almost home and dry."
The Shrews travel to Colchester United on Saturday afternoon.