Born in Carrickfergus, McCullough first played for Portadown, before being signed in 1958 for £5,000 by London club Arsenal.
[2] A left back, he soon made his debut for the club, against Luton Town on 26 December 1958.
He went on to appear ten times for his country, scoring no goals, with his final cap coming against England in a 2-0 defeat on 22 October 1966.
[citation needed] He had played 268 matches in total for Arsenal, scoring 5 goals.
[2] He was sold to Millwall in August 1966, and later had spells at Bedford Town, Cork Celtic and Derry City.