"We're at a critical stage of the season," he said.
"A little bit of complacency has set in and we need to get back to what we were doing when we were winning matches.
"We are not realistically going to get relegated from the Premiership. Liverpool and Newcastle are chasing the fourth Champions League place but we have got a great chance to finish in the top six, although the top eight is more realistic.
"We also want to get as far as we can in the cup, but we won't do that if we continue to perform the way we have been because we have been below par for the last two or three matches."
