The former Spurs midfielder has, however, insisted that the player still has a future at the Hawthorns despite his antics.
Tottenham Hotspur had several bids rejected for the forward throughout the summer as his current employers, West Bromwich Albion, refused to enter into discussions regarding terms they deemed to be unacceptable.
Mauricio Pochettino’s side also came in with two late bids on deadline day to try and secure Berahino, with West Brom owner Jeremy Peace turning both down just hours before the 6pm deadline.
That led to Berahino venting his frustration on Twitter, vowing never to play for the Baggies again, and Redknapp has questioned the thinking behind such an outburst.
"I think Berahino is a very good player, but to behave like that is appalling,” he told Sky Sports.
"To say you're never going to play for West Brom again. What are you going to do for six months? You've got to play some football somewhere. It's a ridiculous thing to say for the young man."
Berahino still has a future at West Brom despite antics
The former Spurs midfielder has, however, refuted claims that the player now has no future at the Hawthorns.
Given his actions, it is easy to imagine that everyone from the fans to chairman Peace are not impressed with Berahino, with the 22-year-old now finding himself in a very uncomfortable position.
At his age, he cannot afford to be sitting in the reserves, as it will be hugely detrimental to his development, while conversely West Brom cannot afford to have one of their best players stuck on the sidelines.
And Redknapp believes that a goal against Aston Villa in a couple of weeks will see this whole sorry episode forgotten about.
"People will say his position is untenable now, but I don't agree with that," he added.
"We've seen it many, many times before where the player will say 'I don't want to play for that club ever again'. They won't be building a statue of Berahino outside West Brom, but if he scores a goal against Aston Villa in a couple of weeks, I'm sure they'll be delighted with him."