The former Tottenham boss also believes forcing the player to stay would be problematic for manager Brendan Rodgers.
The England winger is not expected to stay an Anfield having reportedly told the club he wants to leave, and a number of Europe’s elite clubs are said to be interested in a move for the player.
It would be a big blow to Reds manager Brendan Rodgers with Sterling having enjoyed a rapid progression under his stewardship, becoming a key player in the side as a result.
And Redknapp believes a deal is already in place, and that is why there is now talk about him leaving.
“What are you going to get out of Raheem Sterling if you force him to stay against his wishes?” he said.
“There’s somebody who’s spoken to his agent, there’s no danger, there’s a deal lined up somewhere, we mustn’t kid ourselves. So whatever club it is, they’d have made an offer, they’d have had a meeting with the agent and there’ll be a deal on the table.”
Liverpool would be reluctant to lose their star man, though, and it is likely that only a bid that is impossible to refuse would tempt them to sell, especially to a Premier League rival such as Manchester City - per the Daily Mirror.
It would be a dangerous situation for the club, though, were they to reject a transfer and have an unhappy player on their hands, and although Redknapp doesn’t believe the player would stop trying, he says it would be a problem.
“I know he’s not going to not try,” he added.
“But if his head’s not right you’ve got a problem. So you’ve got to try and get him in on his own, talk to him and say ‘look, we want you to stay’ and if he says ‘well I don’t want to stay’ then I think you’ve got to sell him.”