The Spurs boss saw the Frenchman score twice during Marseille's 2-0 win over Lille last Sunday.
"People have said he might be available but I don't think they will sell him," Redknapp told reporters.
"It was a good performance [last weekend]. It probably put another £5-6m on his asking price."
Spurs, who are currently third in the Premier League table, travel to league leaders Manchester City on Sunday.