United are likley to send a largely reserve/youth squad for the game against the Pilgrims, as the match is sandwhiched between friendlies against Nottm Forest on July 26 and Aston Villa on August 5.
No date has yet been set for the annual friendly against FA Vase Winners Brigg Town at The Hawthorns.
Confirmed Pre-Season Dates:
July 22: SUFC vs Manchester United XI
July 26: SUFC vs Nottm Forest
Aug 2: Boston vs SUFC
Aug 5: SUFC vs Aston Villa