Throughout the season former player Clive Walker provides radio and TV commentary on Chelsea's games. Here he selects five aspects from yesterday's come-from-behind victory that caught his eye…

When a team scores in the first 14 seconds all your pre-match planning more or less goes out of the window, so it was no surprise Jose Mourinho decided to change things so quickly. Although we didn't play badly in the first half, we needed to threaten the Southampton goal more after the break.

Southampton pressed very high up the park, which made it difficult to pass the ball through midfield. The introduction of Demba Ba at half-time meant we had the option to go longer when Southampton were pressing, but we could still go through midfield if we wanted.

Everybody impressed in the second half. They were all enjoying the intensity of the game. Because we were so poor in midweek I felt like there was going to be a reaction, irrespective of Southampton's early goal. The work-rate was phenomenal and sets a precedent for the rest of the season.

We looked more threatening from dead balls yesterdays. The delivery of set-pieces is so important - you can practice all you like on the training ground but in a game you may only get one chance. The players in the box have to get into the right position and the player delivering the ball has to put it in the right place.

Juan Mata was responsible for set-pieces yesterday and we know he's got a magic left foot. When you're out of the team it can mentally get to you, but Mata was everywhere. He has that ability to open the door and if he finds space he will crucify any team. His cross for JT's header was perfect.

Clive Walker is part of the commentary team for games on this season. Go to our Matchday Live section or hear it via our Mobile App.