Redknapp said: "Jermain will always get his goals and in the end he's won the game for us with his finishing. That's what you get from him.
"He was left out of the England side on Wednesday but I don't think it's worried him because he's in the squad and he'll get his chance again.
"We were doing all right with the 3-5-2. I just thought we could sharpen things up and it's flexible for us.
"We played all the game like that at Everton a couple of weeks ago and won 3-0.
"But I also wanted to see the new guy (Algerian loanee Nadir Belhadj) we've brought in since then.
"He's done so well in training, got bags of ability and determination and made a great contribution at left-back."
Redknapp jokingly confirmed: "He doesn't speak a word of English but he's only on loan so I don't know whether we can afford a translator for him.
"It doesn't matter if he doesn't understand me, though. We've got a lot of players who speak French and he'll get by."