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.
Unbeaten Chelsea will travel to St. Mary's Stadium to take on a struggling Southampton team on Sunday in hopes of keeping pressure on league-leading Manchester City. Olivier Giroud was fouled inside the area, but only a corner kick was awarded.
Southampton improved at the start of the second half and should have got themselves on level terms when Bertrand was found at the back post, but the left-back sent the ball over the bar from six yards out.
Looking at the goalscorers for all three clubs this season, there is a stark contrast in the shared responsibility at Man City and Liverpool for sticking the ball in the back of the net.
Life after Antonio Conte suits Chelsea's star players.
The Belgian now leads the way in the Premier League top goalscorers table with six, and Southampton will have find a way to nullify him if they're to come away with anything.
He has played seven games this season in the Dutch League with an assist and scored for Ajax in their 3-0 win over AEK Athens in the Champions League. He also made his substitutions at the right time, the key one allowing Morata sufficient time to score his second goal in as many games. While the Blues looked bereft of ideas in the final third last season, Sarri's side are bursting with creativity - allowing talismanic forward Eden Hazard to flourish in a formation that suits him down to the ground.
The Blues head to the game following a 1-1 draw against Liverpool in the Premier League last weekend.