Kalou started the season with Chelsea playing in the club's second league game, against West Brom; he was substituted off, however, after only 34 minutes.
He was an unused substitute against Sunderland and Bayer Leverkusen, but he started in Chelsea's first League Cup match of the season against Fulham.
Chelsea won 4–3 on penalties, with him converting the second-last penalty.
On 28 September 2011, Kalou came on for Frank Lampard in the 83rd minute.
He then was booked for handball in the 85th minute which led to Roberto Soldado scoring a penalty; the score ended level at 1–1.
Kalou's first goal of the new season came in a 5–0 rout of Belgian side Racing Genk on 19 October 2011.
He scored in a 2–1 win at Goodison Park against Everton in the League Cup, then scored his first goal in the Premier League season in a 3–0 away win against Newcastle.

Following the appointment of Roberto Di Matteo as interim manager, Kalou fought his way back into the first-team squad; under André Villas-Boas, he was frozen out, only making four starts in over seven months.
Kalou scored his first goal in the season's edition of the FA Cup when Chelsea defeated Leicester City 5–2 at Stamford Bridge.
This goal put him alongside Sergio Agüero as the only players to score in the Premier League, League Cup, FA Cup and Champions League in the season.
Kalou then netted a vital away goal in the first leg of their Champions League quarter-final clash with Benfica after some great work from strike partner Fernando Torres.
Chelsea won the game 1–0.
Kalou's goal against Benfica was his 58th for the club.
On 29 March 2012, he claimed he had been frozen out by former Chelsea manager André Villas-Boas.
On 21 April, Kalou made his 250th appearance for Chelsea in a 0–0 draw away to rivals Arsenal.
He started both the 2012 FA Cup Final and Champions League final, both of which were Chelsea victories.

On 1 July 2012, Chelsea officially announced that Kalou's contract had come to an end along with José Bosingwa, after spending six years at the London side.
He had made 254 appearances for the club, including 147 starts, and scored 60 goals.
After his release, Kalou was linked with numerous clubs across Europe, including the likes of Schalke 04, Liverpool, Galatasaray, Newcastle United and Arsenal.
Kalou started the season with Chelsea playing in the club's second league game, against West Brom; he was substituted off, however, after only 34 minutes. He was an unused substitute against Sunderland and Bayer Leverkusen, but he started in Chelsea's first League Cup match of the season against Fulham. Chelsea won 4–3 on penalties, with him converting the second-last penalty. On 28 September 2011, Kalou came on for Frank Lampard in the 83rd minute. He then was booked for handball in the 85th minute which led to Roberto Soldado scoring a penalty; the score ended level at 1–1. Kalou's first goal of the new season came in a 5–0 rout of Belgian side Racing Genk on 19 October 2011. He scored in a 2–1 win at Goodison Park against Everton in the League Cup, then scored his first goal in the Premier League season in a 3–0 away win against Newcastle.
Following the appointment of Roberto Di Matteo as interim manager, Kalou fought his way back into the first-team squad; under André Villas-Boas, he was frozen out, only making four starts in over seven months. Kalou scored his first goal in the season's edition of the FA Cup when Chelsea defeated Leicester City 5–2 at Stamford Bridge. This goal put him alongside Sergio Agüero as the only players to score in the Premier League, League Cup, FA Cup and Champions League in the season. Kalou then netted a vital away goal in the first leg of their Champions League quarter-final clash with Benfica after some great work from strike partner Fernando Torres. Chelsea won the game 1–0. Kalou's goal against Benfica was his 58th for the club. On 29 March 2012, he claimed he had been frozen out by former Chelsea manager André Villas-Boas. On 21 April, Kalou made his 250th appearance for Chelsea in a 0–0 draw away to rivals Arsenal. He started both the 2012 FA Cup Final and Champions League final, both of which were Chelsea victories.
On 1 July 2012, Chelsea officially announced that Kalou's contract had come to an end along with José Bosingwa, after spending six years at the London side. He had made 254 appearances for the club, including 147 starts, and scored 60 goals. After his release, Kalou was linked with numerous clubs across Europe, including the likes of Schalke 04, Liverpool, Galatasaray, Newcastle United and Arsenal.
Salomon Kalou