Olivier Giroud celebrates scoring against Southampton

Olivier Giroud says Chelsea are determined to keep fighting to secure a top-four finish.

The French international struck twice as the Blues scored three times in eight minutes for a 3-2 comeback victory at Southampton on Saturday.

The win, coupled with Tottenham's defeat to Manchester City later in the day, means Chelsea trail fourth-placed Spurs by seven points with five Premier League matches to go.

Giroud says Chelsea will treat each remaining game like a final, while there is still even a slight hope of finishing in the top four and securing qualification for next season's Champions League.

"As long as mathematically it is going to be possible, we are going to believe," said Giroud.

"So we take the games one by one and we have maybe five or six finals to play. Let's do the job and we will see what the other teams do."

2:54 Highlights: Southampton 2-3 Chelsea Highlights: Southampton 2-3 Chelsea

Relegation-threatened Southampton stunned Chelsea by sweeping into a two-goal lead thanks to strikes from Dusan Tadic and Jan Bednarek.

However, the Blues turned the game on its head thanks to Giroud's double and another neat finish from Eden Hazard.

Giroud, who was signed from Arsenal in January, admits he was relieved to score his first Premier League goals for Chelsea.

5:31 Chelsea head coach Antonio Conte praised the spirit and desire his side displayed in coming back from 2-0 down to beat Southampton 3-2 at St Mary's. Chelsea head coach Antonio Conte praised the spirit and desire his side displayed in coming back from 2-0 down to beat Southampton 3-2 at St Mary's.

"Obviously I was waiting for that," Giroud told Chelsea's official website of his first Premier League goals for the Blues.

"I have tried so many times to put it in the back of the net. When you are a striker you need to keep going and keep your confidence high, even if I have been playing a bit less in these recent weeks.

"I always used to say that football is an ever-lasting beginning, so you always need to question yourself and in those moments the most important thing is to show some character.

"I have been through some difficult periods in my career and all the time I try to come back stronger and it has happened again in this game, and I am very pleased for me and for the team."