Speculation surrounding Samba intensified when he missed both training on Friday and Saturday's 3-1 win over Fulham.
"I don't think he's thrown one in. He texted in and didn't come to training because he's got severe stomach cramps," Kean said.
"Then he texted on Saturday morning saying he was too weak to play.
"Hopefully he'll be back in on Monday or Tuesday to get ready for Everton next week. He's not for sale, it's as simple as that."
Queens Park Rangers and Tottenham are both interested in signing the £12m-rated defender.