Harrison has kept his place in midfield under new boss Ronnie Moore, but with Micky Cummins and Jason Taylor looking to grab his position he knows he can't afford to let his standard drop.
"I am pleased with my form but that does not mean I can sit back and take anything for granted. We have a fanatastic squad here and I know that we have Micky and Jason waiting in the wings.
."I know I need to keep working hard and performing well on the pitch to stay in the side."
The change in the managerial positions at the club with Moore and Mullen coming in after the departure of Robins and his staff to Barnsley, has seen some changes on the training ground, with the players having to get used to the different styles in training.
Danny, released under moore when at Tranmere, added: "Obviously things have changed since Mark left. Ronnie has brought in his own ideas along with Jimmy Mullen.
"The training has been slightly different and everyone is still getting used to each other. The manager said he would not make wholesale changes and he has not yet, but no-one can rest on their laurels.
"Everybody knows they have to work day in and day out."
With Moore being given the go ahead from chairman Tony Stewart to add to the squad Danny concluded: "It can only be a good thing. It just shows where the team wants to be heading.
"There is always room for improvement and I'm sure who ever the manager brings in will be quality We have one of the strongest squads in the league and everyone is fighting for their place. Competition for places is healthy and that is what keeps you going as a player."