The former Liverpool man believes the youngster would benefit from increased game time away from Old Trafford.
United completed the signing of highly rated PSV Eindhoven and Holland forward Memphis Depay on Thursday, their first big signing of the summer transfer window.
His addition to the side adds yet another forward to an already packed attacking line-up, with the likes of Wayne Rooney, Robin Van Persie and Radamel Falcao all competing for a starting berth up front.
That means the likelihood of Wilson getting a game is slim at present, and Redknapp expects a loan move will be arranged for him in the meantime.
“With all this activity in the forward areas, I’d expect young James Wilson to go out on loan,” he said.
“Perhaps to one of the teams that comes up, to try to get some Premier League experience and score some goals. He’s a real player and is a star of the future but it’s not ideal at 19 years old to not be playing first-team football.”
The youngster has made sporadic appearances during Louis Van Gaal’s first season in charge, despite being a regular member of the first-team squad.
Wilson caught the eye last season with a double in the 3-1 win over Hull City on debut, while he also bagged a goal against QPR in January, and it seems that he is one prospect Van Gaal expects to develop in the future.
Redknapp, though, says that if he manages to have an impressive pre-season under the Dutchman, there may be chance for him to break into the senior ranks, although a loan move is still probably the best option.
“If he has a great pre-season he could force his way into the first-team squad,” he added.
“That’s happened before – it happened to me at Liverpool – but he’s got a lot of competition in those forward areas and he might just need to go and score loads of goals somewhere else and then come back.”