Tony Pulis feels West Bromwich Albion had allowed itself to become complacent.
Pulis replaced Alan Irvine on 1 January when Albion, currently playing in their fifth successive season in the Premier League, were 17th in the table.
"Have a look at the Championship and how many teams who had long periods in the Premier League," said Pulis.
"What they did was take their foot off the pedal and became complacent."
Pulis told BBC WM 95.6: "We've got to shake the complacency off.
"It's not easy to do and we haven't got a lot of time to do it."