Captain Shaun Dyche has called on Northampton to improve after taking 11 points from their first eight games.
"We have only lost one game so far this season, but we know we have got a lot more to do," he told the club website.
"We are not the finished article, but we are all working hard to get out of this division.
"Any team would miss Andy Kirk because he has the habit of scoring goals - we have created chances without him, but we'd like to have him back."