Neville, who retired in 2011 following 19 successful seasons at Old Trafford, says the nature of the club is such that the Japanese midfielder will have no trouble settling in.
"The manager's philosophy has always been to get deals done early and get the new players on tour so they can see what the dressing room is like and settle in," Neville told ManUtd.com.
"You can guarantee that by the end of the tour they'll feel like they've been a Manchester United player for a long time.
"You hear stories about other clubs where new players don't feel particularly welcome. I can say with confidence that the manager and the players at United would never let that happen. Everybody's made to feel very welcome straight away."