The Spurs boss is said to be keen on bolstering his defensive options as concerns grow about the long-term fitness of Ledley King and William Gallas.
"I like Samba, he is a good player," Redknapp told a press conference. "I wouldn't want to say it's an impossibility.
"At the moment he belongs to Blackburn but he's a good player."
Samba joined Rovers in 2007 from German club Hertha Berlin.