The young winger is not enjoying the best of seasons at United after an impressive campaign last term.
The 20-year-old has already played 105 games for the Red Devils, but is still learning his craft.
Speaking to Stake.com, five-time Manchester City Premier League winner Aguero said: "Sometimes, people forget how young Alejandro is.
“His raw talent got him to the Premier League at a young age, and he's proven his worth already.
"I've seen many of his teammates leaning in to help him develop as a pro player, and that's massive.
“If he has that type of mentorship, I'm sure there's a bright future ahead of him."
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