Previously with Celtic and Belfast Celtic,  Cornelius 'Con' Tierney played for Exeter City in the mid-1930s after signing from Guildford City. He later played in Canada.

Making an impression with Bo’ness, Con signed for Celtic in 1930 and made seven league appearances as well as featuring in the Glasgow Cup. Having a loan spell with Belfast Celtic in 1931/32 (and representing the Irish League against the Football League), he subsequently signed for Guildford City in 1932 where he caught the eye when playing against Exeter City reserves.

Arriving at St James’ Park in the summer of 1934, Con made his league debut against Clapton Orient in September 1934. After a run of four games he enjoyed a more extended stay in the first-team from the end of January 1935 during which time he scored his only goal for the club in the 3-1 home win over Brighton and Hove Albion in March 1935. 

Released at the end of the season, Con returned once more to Northern Ireland to play for Glenavon ahead of signing for the team of the Dome Gold Mines Company in Northern Alberta, Canada.

It is believed Con died in 1942 at the age of 33.