The Doha-based club announced the signing on Twitter, saying the 37-year-old would be unveiled later on Tuesday.
Eto'o, a four-time African footballer of the year, becomes the latest big-name arrival to join the Qatar Stars League after ex-Spain international Xavi and former Netherlands playmaker Wesley Sneijder.
Africa Cup of Nations
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He played with Xavi at Barcelona and Sneijder at Inter Milan, winning the Champions League with both teams.
Eto'o is Cameroon's all-time leading goalscorer with 56 goals, and twice an African Cup of Nations winner.
Transfers
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Spanish Super Cup
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