The peripatetic France striker seemed like a stop-gap and few expected him to be part of Chelsea's long-term future.
He had just spent 18 months at Bolton Wanderers after spells at Fenerbahce, Manchester City, Liverpool, Paris St Germain and, following the best piece of business in Arsenal's history, Real Madrid who he joined for 23 million pounds.
This season, however, Anelka seems to have stepped up a gear and gives the impression that not only is he enjoying his football, a rarity for a man nicknamed 'the incredible sulk' , but he is increasingly the focal point of Chelsea's attack.
"Not only in the Champions League but in all competitions Anelka is having a very good season," Chelsea boss Carlo Ancelotti said after Tuesday's win.
"He is a very important player, sometimes playing as a striker close to Drogba, sometimes helping the midfield. His position is very important for our play."
He scored there in last season's impressive 4-1 triumph and any sort of repeat would be a huge help in Chelsea's title push.
"It is a very good time for us and we have to keep this going because the players are in good condition, have a good mentality and want to maintain this momentum," Ancelotti said.
"We know very well that Sunday will be a very difficult match but we know that now is a very good time to play Arsenal," he added, with their opponents hit by a string of injuries.
