The former England centre-back was appointed manager on Tuesday evening on a contract until the end of the 2021-22 season.
"My job is to make sure the guys realise there is enough games to get ourselves out of this situation," he said.
"We need to give teams more problems and go for it.
"We've got to overachieve now. We've got a deficit and we need to close that. Instead of being on the back foot we need to be on the front foot in games.
"We've got enough games to get out of this situation but it has to start now because time is precious. My remit is to get these guys working together.
"We've got some good players here but we need to start working together and be competitive. We've not really been doing that.
"Hopefully the team can respond to that and start on a good footing and that's down to me."