Millwall manager Kenny Jackett admits his side could soon find themselves in a relegation battle.
The Lions are without a win in four games and Saturday's 1-0 home defeat by Sheffield United leaves them hovering just three points above the bottom three.
Jackett takes his side to fourth-bottom Middlesbrough next Saturday and is desperate to arrest their slide.
"Four matches without a win is a concern because winning is everything in this league. We're looking over our shoulders," he said.