He made his senior debut in a 2nd round League Cup replay against Gillingham in September 1966 shortly after turning 20.

[5] His league debut came against West Ham United in November 1967, when he came on as a sub for George Graham.

[6] Jenkins played in the 1968 League Cup final, in which he was injured in a collision with Leeds United goalkeeper, Gary Sprake.

However, he did not secure a regular place in the Arsenal side until the following season when he made 14 league appearances, scoring three goals, before being swapped in mid-October for Tottenham's winger, Jimmy Robertson.

His final game for Arsenal was against Coventry City on 12 October 1968, when, as it happened, he came off to be replaced by George Graham.