Walsh, also a former Spurs striker, hopes Blues fans applaud Redknapp upon his return.
"It's definitely going to be a tasty game," he told The News. "You have some fans who will be grateful for everything that Harry did, and there will be other people who will be booing and hissing.
"It will be interesting to see how the game will unfold now that Pompey have got that win on the board. The club could never have dreamed of the success they would have under Harry.
"He got them promoted, he established the side in the Premier League, he won the FA Cup and he got them into Europe. Because of the clout he has he was able to get the players in to do that. Harry was able to attract those players."