The 34-year-old winger was without a club after his contract with Bundesliga side Hertha Berlin expired this summer.
The terms of Kalou's deal with Botafogo remains unclear but he has become the second high-profile signing at the club following the arrival of Japanese midfielder Keisuke Honda in January, reports the Daily Mail.
When Honda was unveiled at Botafogo, over 13,000 fans attended their stadium to see a first glimpse of their new signing.
Ivory Coast forward Kalou departed Hertha Berlin this summer after spending six years with the club, scoring 53 goals and creating 16 assists in 173 appearances.
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