United's second game in the newly rebranded Leasing.com Trophy was due to be staged at Sincil Bank on 27 August but the Imps' progress in the Carabao Cup, beating Huddersfield Town to set up a home tie with Premier League side Everton in the second round, has forced a postponement.
A new date for the clash will be announced in due course.
Meanwhile, the club has confirmed the home games against Fulham (13 September) and Norwich City (27 September) will kick off at 19:00 BST.
Entry is free for all spectators for both fixtures.
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