The 21-year-old has had a sparkling first half to the season - highlighted by a brilliant hat-trick in Spurs' 4-3 group-stage defeat to Inter Milan on their first trip to the San Siro - but is struggling for Tuesday with a back injury.
Asked whether Bale would feature against the Serie A leaders, Redknapp told Sky Sports News: "No. He's struggling, to be truthful.
"I'd like to be able to scare Milan a bit and say he's going to be available but he's struggling to get over this back injury.
"The specialists don't see too much of a problem that should keep him out too long.
"We couldn't take a chance. He doesn't feel he's ready to play. We'll leave it to him."
Source: PA
Source: PA