Eto'o, now 32, has won the UEFA Champions League on three separate occasions and will bring a wealth of experience to Chelsea.
Although he has signed on a one-year deal, there are good reasons why this is a fine piece of business by Chelsea.
Eto'o's Tactical Flexibility
Samuel Eto'o will not only bring in more cover as a central striker, but can also provide back-up on the wings or as one of the three attacking midfielders behind a striker. For Inter Milan under Jose Mourinho he played off Diego Milito as a winger in support, sacrificing his natural inclination to be the main forward.
This is crucial with regards to Romelu Lukaku, who is Chelsea's most promising young striker having scored 17 times for West Brom last season. Had the club signed Wayne Rooney then Lukaku would have almost certainly been limited in his chances, given that Rooney is 27 and in his prime. Eto'o's signing is more of a short-term deal and it is also likely that he could feature in the same starting line-up as Lukaku as a support striker, or winger.
Even as a lone forward he is capable of peeling off wide to allow Juan Mata, or whoever is playing from the right, to take up more central positions. If we observe his action-areas from the last Russian League game he scored in we can see this:
This ability to peel off can help Chelsea's fluid form of attack. Too often Fernando Torres or Demba Ba were static, which is something that even at the age of 32, Eto'o will not be. It is in this regard that he can be effective, assuming he can keep fit for the duration of the season.
Eto'o, 32, didn't enjoy his best form for Anzhi this season, netting just twice in his six games. The striker, usually so prolific in front of goal, only managed 47% of his shots on target for Anzhi, at a chance conversion rate of a lowly 11.8%.
It's worth noting, though, that the whole Anzhi side has struggled this term and that last year he was in slightly better form scoring 10 in 25, as well as scoring 13 in 22 the season prior to that. In all he has netted 25 goals in 51 games for Anzhi, which is a more than respectable return.
For Chelsea he won't be expected to score 20+ league goals but will be utilised as a squad player who can use his vast experience to help turn games. Eto'o has lost a degree of pace but he is still a very intelligent player both on and off of the ball, creating over a chance per game for his team-mates at Anzhi.
Samuel Eto'o is a relatively low-risk signing for Chelsea despite his age. The Russian League is nowhere near the same standard as the Premier League but he had a good goalscoring record there. Not only that, but his prior working relationship with Jose Mourinho and the fact that he's linking up with former Anzhi team-mate Willian means he should settle in very easily. If he can even provide just 10 goals it would be a plus and his tactical flexibility, both wide right and up top, means that he can bolster Mourinho's forward options.