The 20-time English champions are expected to be active in the upcoming market despite the financial impact of the coronavirus outbreak.
During a Q&A on Twitter, Neville was asked whom he would like to see Ole Gunnar Solskjaer's side sign ahead of the 2020-21 campaign.
The former right-back decided not to pick out a particular player but instead said that the Red Devils should be looking at individuals between 20 and 25 who are not yet at their peak.
"Not a name but I like the 20-25 year olds. The ones that have that next level in them type of signing," Neville wrote on Twitter.