He started the 2003/04 season as back-up for Romain Larrieu. However Larrieu sustained an injury to his cruciate knee ligaments and McCormick soon established himself as being a competent replacement. A 2-0 victory over Stockport County on 24 January 2004 saw McCormick set a new club record of seven consecutive clean sheets (games without conceding a goal).

His great performances have led to the Argyle fans creating the following chant: