The 22-year-old has been linked with a host of English clubs, including Arsenal, Newcastle United and Aston Villa.
"Moussa Sissoko has three choices: extend his contract with Toulouse, leave this winter or stay on the bench until June," Sadran told BeIN Sport.
"If he extends his contract, he'll have the chance to leave at the end of the season with a very big bonus.
"There are offers from Marseille and Monaco, and some English clubs are trying to get involved. If he doesn't decide quickly, I'll take a decision."
Sissoko's current contract with Toulouse runs out at the end of the season.