Relegation is a possibility for Chelsea, says the Premier League champions' interim boss Guus Hiddink.
The Blues are 14th in the top flight, six points off the bottom three, and their next two league games are at home to Everton and away to Arsenal.
"It's reality," said Hiddink, who took over from Jose Mourinho in December. "We have two difficult games coming up.
"If you don't gather points there, you don't know what the others do. The Premier League can surprise you."
Chelsea were one point above the relegation zone when Mourinho departed the club.