Substitute Olivier Giroud scored twice as Chelsea came from 2-0 down to win at Southampton and keep alive their faint hopes of a top-four finish in the Premier League.

Dusan Tadic's opener, a placed effort following Ryan Bertrand's marauding run, and Polish defender Jan Bednarek's left-footed shot looked to be lifting Saints out of the bottom three.

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.

The France forward's header - his first league goal for Antonio Conte's team - and left-footed drive sandwiched Eden Hazard's left-foot finish as the Blues moved within seven points of fourth-placed Tottenham.

For an hour, Chelsea's performance epitomised their travails since the turn of the year, with the defending champions having collected just 12 points from a possible 33.

Willian's 55th-minute shot was their first effort on target, and there were question marks over the application of several players in the build-up to both Saints goals.

One of those players - wing-back Marcos Alonso - was also fortunate to escape without punishment for standing on the back of Southampton forward Shane Long's calf in the first half.