Grimsby Town boss, David Artell, has said their win over Manchester United on Wednesday night, was an accumulation of several months of work.
The League Two club sent United packing in the second round of the Carabao Cup in front of their fans.
Charles Vernam and Tyrell Warren gave the hosts a two-goal lead in the first half, before Bryan Mbeumo and Harry Maguire levelled for the Red Devils.