21-year-old Scottish forward Allan left Liverpool to join Celtic on 1 May 1897 for £50 after a two-year spell with the Reds, during which time he netted an outstanding 41 goals in 49 games. Allan would return to Liverpool a year later, but sadly passed away in 1899 after contracting tuberculosis at just 24 years old. It has been said that Allan had the potential to have been one of the all-time great strikers.