In his column for The Sun, Redknapp wrote: "Wenger has done good business with Campbell. It will not cost Arsenal much, as I am sure it's a pay-as-you-play sort of deal.
"And Wenger can rely on Campbell to do the business.
"He will give 100 per cent and still has the ability to play Premier League football.
"As well as being good on the pitch, Campbell will strike an inspiring figure for the club's young players."