It would be good for him if he joins the
pre-season with us and play against team with strong attacking talent like Madrid, Barca, Bayern, PSG, etc. Those games will increase his playing level and mentality with a slight decrease of pressure.
For his next season, I don't think it would be good for him to joins us right away. Play as a starting keeper on loan in a Serie A would be the best thing for him to have better knowledge of the league. He can be 2nd keeper if we cannot find any club that can starts him in Serie A.