He was appointed as a FIFA referee in 1981, serving the world body for 11 years until 1991,[3] when he had to step down due to age restrictions.
[4] Worrall awarded Arsenal a penalty in the last ten minutes, with the score at 2–1 to the 'Gunners', but Nigel Winterburn failed to convert it.
[6] Worrall was the referee for the 1992 European Championships qualifier between Italy and Hungary at the Stadio Arechi, Salerno, on 1 May 1991.
[1] His last appointment on the FIFA list, and his highest international honour, was to referee the 1992 UEFA Cup final first leg at the Stadio Delle Alpi on 29 April 1992 between Torino of Italy and Ajax of the Netherlands.
He reached the standard retirement age at the end of the 1993–1994 season but was granted a one-year extension as a result of his strong performances.