The Italian giants said Wednesday they were confident of signing the England midfielder for a short spell in between seasons of Major League Soccer, where Beckham plays for LA Galaxy.
And Ince, who had a spell with Inter Milan after playing alongside Beckham at United, has no doubts about his former Old Trafford and England colleague's ability to adapt to the Italian game.
"His quality with the ball is the best I have ever witnessed. He is an inspirational player, he has been great for English football, he's an ambassador and a really good friend.
AC Milan arrive at Fratton Park on November 27 for a UEFA Cup tie and Redknapp added: "Would he come to Portsmouth? Why not? His missus (Beckham's wife, the former pop star Victoria Adams) might prefer shopping in Portsmouth to shopping in Milan. I don't know.
"The fact is he is still a top player and wants to play. And I'm sure we wouldn't be the only ones interested if he didn't go to Milan. They would be queuing up."
