The African star, who now plays for Turkish side Antalyaspor, spoke with frustrated supporters of the club after the team slipped into the relegation zone in the Turkish Super Lig.
Antalyaspor have failed to win in their past seven matches, and the clubs supporters have made their dissatisfaction heard.
"We have Besiktas next, what will the state of the team be and when will we win?"
The African answered with the following:
"We will finish in the top 10 of the Super Lig, I stand by what I said and my promise.
"Believe me, I will give you €100 000 if we don't finish in the top 10."
Eto'o apparently took down the name and number of the fan he spoke to, so it will be interesting to see how this situation unfolds...