The two players are currently in Brazil with the Ivory Coast national side.
The Ivorian FA said: "The entire Ivorian delegation want to show their support to the players.
"In such a sad situation, the Ivory Coast team and the entire delegation here in Brazil, show their support to the Toure brothers and their family."
"The president of Football Ivory Coast Federation and the Executive Committee ask Ivorians for their prayers."
A statement on Liverpool's official site reads:
The thoughts of everybody at Liverpool Football Club are with defender Kolo Toure following the news of the passing of his brother, Ibrahim, aged 28.