The game had been pencilled in should the Mariners have exited the Lincolnshire Cup.
Former Town striker Nathan Jarman now plays for United after a summer move from Chester.
Our penultimate warm-up game will take place on Tuesday 30th July, kick-off 7pm.
Meanwhile, tickets for Tuesday's pre-season friendly against League One side Bradford City are now on sale. Click here for more.
Fixtures & Results