Neville described Sesko as "awkward" and "well off it" after the 2-2 draw against Nottingham Forest, contrasting him with other summer signings.
Sesko, a £73.7m acquisition, has scored two goals in 11 appearances, has struggled to settle compared to Matheus Cunha and Bryan Mbeumo.
Amorim characterised Sesko as a "control freak" due to his dedication, including early arrivals and late departures from training.
Amorim acknowledged Sesko's current struggles but expressed confidence in his long-term success, advising him to view criticism as part of the process.