Writing in the Sunday World, Aldridge said: "Going forward, there is no better full-back in the game and the cross Trent put in for Diogo Jota's goal at Arsenal last Saturday highlighted the quality he can bring to the team when he gets forward.
"The issue for a player of his age has always been gaining experience in defensive positions and learning from mistakes, which is something he needs to do quickly.
"What we don't know is how the young man is dealing with everything flying in his direction right now.
"Gareth Southgate's decision to drop him from his England squad last week only added to the negativity surrounding him.
"I thought Southgate's treatment of Trent was very harsh, as this is a player who could be the best full-back on the planet for the next ten years and he was being tossed to one side the moment he hits some bad form.
"If Southgate had spoken to Trent and they had decided he could do with a rest for the international break, then it would have been a different story.
"Instead, the England manager came out and said he had been dropped and it gave the media a chance to pile in on Alexander-Arnold.
"I'm convinced this lad will get back to his best. Like so many players in Klopp's team, he has fallen off a cliff in terms of confidence and form over the last year."