Paris - Former France striker Djibril Cisse has been released by police after being detained for questioning as part of an investigation into a blackmail case that allegedly involves another football player.
The Versailles prosecutor's office said in a statement that Cisse was released without appearing before a judge.
Also read: No satisfaction for Ronaldo despite fourth Golden Boot
Three other people were also placed in custody on Tuesday morning over an extortion plot.
Cisse was question of suspicion of conspiracy to blackmail, a charge with a maximum prison sentence of five years.
A prosecutor's spokeswoman said the identity of the victim won't be revealed "out of respect for his/her private life." According to reports in the French media, the extortion plot targeted another France international.
The 34-year-old Cisse, whose career has been marred by injuries, is currently without a club. A former Liverpool player, Cisse scored nine goals in 41 games for France.