After a successful loan spell at Ipswich - where he scored 10 goals in 17 games - Campbell is now back.
And new boss Redknapp wants him to prove he is worth a place in his 25-man squad for the rest of the season.
Arry said: "I've had a lot of calls from Championship clubs about DJ. But he's back with us and I'm looking forward to getting him involved.
"I don't care what went on under previous managers. I'll judge players from what I see.
"I've only ever liked DJ when I've seen him play before. He's always worked hard and scored goals."