The Pilgrims will kick-off their preparations with the short trip to Boston Town's DWB Stadium on Tattershall Road.
The match will be played on Saturday July 8 (kick-off 3.00pm).
A visit to Stamford AFC's Zeeco Stadium will unfold on Tuesday July 18 (kick-off 7.45pm). Should the match take on the mantle of a Lincolnshire Senior Cup semi-final, it would be switched to The Jakemans Stadium on the same night.
United's opponents on Saturday July 22 will be confirmed shortly.