Edouard Mendy - Had to gather the ball more often than Chelsea would have liked at St Mary's. Vision blocked as he tried to save Rome Lavia's strike and couldn't keep it out despite getting a palm to the ball. 6.
Cesar Azpilicueta - decided to give away a corner when perhaps he didn't need to, and his clearance for the resulting kick went to Romeo Lavia, who finished with a fierce strike. 4.
Thiago Silva - A more physical outing from the Brazilian than we often expect and even took it upon himself to carry the ball upfield as Chelsea struggled. 6.
Kalidou Koulibaly - A more secure display than what he offered versus Leeds on his return to the team. He was very good in one vs one situations. 6.
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Marc Cucurella - Produced a vital clearance early in the second half to add to a solid performance. The Spaniard was unafraid to step up for a physical battle against the Saints' forward line. 6.
Jorginho - The Italian remains vulnerable to teams attacking at pace, and tonight was no different. 5.
Ruben Loftus-Cheek - A quieter time on the pitch than what he managed against Leicester and was substituted at half-time. He appeared to have to straping on his knee when he re-emerged in the dugout. 5.
Hakim Ziyech - The Moroccan makes it very easy to admire his cross-field passing and showed some impressive flashes on his first start of the season. He grew quieter and quieter as the game went on, however. 5.
Mason Mount - The England international moments showed some glimpses of his best form in the opening half and provided the assists for Raheem Sterling's goal but once again struggled to sustain an influence on the game. 5.
Raheem Sterling - Once again, there were occasions where it seemed Sterling should possibly do better, but he continued to find the right position and opened the scoring at St Mary's for his third of the season. He could not get involved enough in the second period. 6.
Kai Havertz - The German forward had some clever touches and flicks but did not provide a regular enough threat as Chelsea struggled to find their way to Southampton's goal. 5.
Substitutes
Mateo Kovacic - Produced some excellent passes from the base of midfield when Chelsea changed shape but was perhaps not incisive enough, often enough. 6.
Armando Broja - Started very quickly when he arrived on the pitch after the hour mark and brought the energy that Chelsea had missed. 6.
Christian Pulisic - Provided some energy from wing-back and looked to cross the ball from out wide but often struggled to bring the quality necessary to help Chelsea come back from a goal down. 6.
Ben Chilwell - took his place on the left flank and was fine on the ball when required. 5.
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