Signed from Anzhi Makhachkala in 2013, the Cameroon legend scored 12 times in 35 games before departing on a free transfer.
Eto'o scored his first Chelsea goal against Burnley on October 19, 2013.
Earlier on in the game, Eto'o played his part in one of the most disrespectful goals in Premier League history.
Cardiff City were leading 1-0 when David Marshall had the ball in his hands in his own box.
Eto'o was standing by Marshall and he pounced when Cardiff's number one bounced the ball.
The striker nicked the ball away and Eden Hazard would score to equalise for The Blues.
Cardiff protested wildly but their pleas fell on deaf ears as the goal was allowed to stand.
FIFA rules state that the goal should have been disallowed as Marshall was still in possession of the ball.
Chelsea went on to win 4-1 and Cardiff's manager, Malky Mackay, was livid after the game.
"He [Marshall] bounces the ball. It's a huge mistake. A horrendous error," he said, per BBC.
Mackay went on to make a written complaint to referees’ chief Mike Riley.
Jose Mourinho, meanwhile, praised Eto'o for being clever.
He said, per the Independent: “When I arrived home the first thing I told my kid who likes to play goalkeeper: ‘See the goal and don’t do that, eh?’ And he’s 12. If, in this moment, Fifa says that it’s a foul, it’s a foul. But I think Samuel did well. Maybe the referee did wrong, I don’t know to be fair.
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“But in my opinion, that should be allowed as it was for years. No contact with the goalkeeper, nothing to stop the goalkeeper to make a quick kick – even with space he took 30 seconds.
“The goalkeeper has six seconds to have the ball, correct? They had almost half a minute. That’s breaking the rules. So he [Eto’o] didn’t break the rules. We played our game, a difficult game, and we deserved to win.”