Dundee last week exceeded their season ticket target of 4,000.
Hartley said “That was brilliant. There are difficult circumstances nowadays watching football in terms of finances so it was superb to see us reaching that target.
“Our fans have been so loyal over the years so we want to try to reward them by having a good team on the park.
“I think the supporters realise what we are trying to do here. They are coming out in big numbers and are travelling to watch the team.
“We want to have a team the supporters can be proud of and we think we are giving them that just now. But there is a long way to go.”