Olivier Giroud came off the bench to score two goals on Saturday as Chelsea came from behind to beat Southampton 2-3 in their Premier League clash at Saint Marys.
Huddersfield and Crystal Palace took full advantage with vital wins over Watford and Brighton to leave Southampton five points off safety.
They stay in the relegation zone and are running out of time.
When interviewed by Sky Sports about his performances, the Belgian said: "For the last two months, no, because the results are not good".
Liverpool were rampant in the first 45 minutes but failed to add to their advantage with Salah surprisingly profligate in front of goal.
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The Chelsea legend is not taking success against the Clarets for granted and wants the Blues to make sure they get it right at set pieces as he warned at Burnley there will be no way back from 2-0 down.
Antonio Conte's gamble which saw the introduction of Giroud in place of the listless, Alvaro Morata and Pedro Rodriguez in place of Davide Zappacosta shortly after the Saints second goal, no doubt, sparked a hitherto one sided game into life as the bearded French striker struck his first two Premier League goals since joining the team from Arsenal in January.
"As long as it is mathematically possible we will believe we can reach the top four", said Giroud as Chelsea closed to within seven points of Spurs in fourth.
But, with Mark Hughes seemingly on course for a first league victory as Southampton manager since arriving on 14 March, Giroud sparked a listless Chelsea into life. "I think we've still got enough".