The R's boss suggests that the former Chelsea, Arsenal and Real Madrid midfielder was being heavily linked with a move to Loftus Road from Lokomotiv Moscow but reports suggested that deal had fallen over.
However, Redknapp told Sky Sports News HQ that there is still a chance of signing Diarra who has played 28 times for France during his career.
"I think that one is still going on so we'll see," he said.
Diarra has been with Lokomotiv since joining from Anzhi Makhachkala in August last year and has made 17 appearances for the Russian club.
For breaking stories and all the great banter like us on Facebook: facebook.com/tribalfootball