Over the course of two seasons, and 86 league goals, saw two opposing footballing styles mesh and complement each other to produce one of the finest striking partnerships in Europe. Kalou had the vision and creativity while Kuyt had the gift of finding the back of the net. Their performances on the pitch soon brought them much notability and an affectionate nickname 'K2', a play on the a name of a Belgian pop band.

Salomon Kalou, the son of a teacher, was a talented and technically gifted footballer. He began his career in his native Ivory Coast playing for ASEC Mimosas where he first landed at the age of twelve. The club boasts a world renowned academy which has produced the likes of Yaya Toure, Kolo Toure, Emmanuel Eboué and Didier Zokora.

Looking back on his time there he said: 'I arrived there when I was twelve. Left my home and my family. They were now four hours away' says Kalou. 'I did not see much of my family once I was there. We would maybe get one day off a week and a four-hour journey was too much if I had to get there back in a day. So we all spent a lot of time together; became great friend.'

He soon was making a name for himself with his performances which quickly caught the eye of a number of European clubs, among them Auxerre, where his brother Bonaventure was playing, and Feyenoord. He would eventually sign for the Dutch side, spending much of his first year in Rotterdam on loan at Excelsior.

Dirk Kuyt, a fisherman's son, on the other hand, was somewhat of a late bloomer. Underrated and not much thought of in his early years of playing organised football.

Describing his experiences to the Daily Mail, he said: 'Even then, though, I knew I would have to work hard to get anywhere. I started playing for my local club in Katwijk aan See, a club called Quick Boys, and people always told me the best I could ever hope for was playing first team football for them. “You're a good player,” they'd say. But that's the most you can hope to achieve.”' He would soon prove the doubters wrong as he was somewhat unexpectedly offered a trial at FC Utrecht at the age of 17 before signing a professional contract with them at the age of 18.

Even when he was at FC Utrecht he had his doubters but again rose to the challenge of proving them wrong over the course of five years where he scored 51 goals in 160 appearances. He secured a €1 million Euro move to Feyenoord in 2003. It was here that he formed the potent partnership with Salomon Kalou and saw the birth of 'K2'.

But their partnership was not to last for a longer period of time. Rafael Benítez was an admirer of Kuyt and Kalou wanted to play for the Netherlands at the World Cup of 2006 but was denied naturalisation which hastened his departure to Chelsea in 2006.

Their partnership between 2004 and 2006 may not have brought many trophies but it did bring new life to the Eredivisie that was dominated by Ajax and PSV year on year. However there were talks of a possible reunion after Dirk Kuyt returned to Feyenoord this season. Who knows, maybe we will be saying K2 dominating the scoring charts again.