As a result, the Blues now sit second in the Premier League, level on points with leaders Manchester City and third-place Liverpool, but Melchiot is convinced Sarri's side will need to demonstrate more conviction across the pitch and not just in the final third.
The Belgian attacker opened the scoring for his side while his teammate Ross Barkley sealed the victory with a sublime finish in the second half.
8 - Sarri's big call today was starting Ross Barkley ahead of Mateo Kovacic and the decision was vindicated as the midfielder gave Chelsea an added cutting edge up front.
Chelsea defeated Southampton 3-0 at St. Mary's to get back to winning ways in the Premier League.
Despite the convincing scoreline, Southampton created some clear openings, including a jaw-dropping miss from Danny Ings from three yards out.
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With the look of things, Chelsea are now a major contender in the EPL alongside Liverpool and Man City.
Hazard's brilliance comes as no surprise, but Barkley's might, given his tough start to life at Chelsea. "Definitely I'm very happy with him".
"He is doing well and working hard on the training ground". The Netherlands global escaped punishment for his challenge on Giroud in the area but then saw Hazard capitalise on some lazy defending as he stepped out of defence and left Chelsea's main man all alone. While ultimately he was unable to prevent Hazard from getting on the score sheet, Hoedt made a number of key tackles, and spared his side a crushing defeat with his tireless performance.
Meanwhile, Southampton head to the game after losing 2-0 against Wolves last weekend in the Premier League.
Alvaro Morata, who came off the bench on Olivier Giroud's place, piled more misery on the hosts by netting an easy goal in the dying minutes of the game.
- Hazard scored and assisted in a Premier League game for the first time since October 2016 - which was also at St Mary's against Southampton.