 Complete the following phrase:  Gatting started his career at Arsenal, joining as an apprentice in July 1975. He turned professional in 1977, and quickly rose up the ranks, making his first-team debut as a substitute against Lokomotiv Leipzig in a UEFA Cup match on 13 September 1978; Arsenal won 30. He immediately held down a first-team place, making 30 appearances in the 1978-79 season. He was not part of the squad that won the 