Gary signed a two-year contract with Morton in June 2016 following a season-long spell with Queen of the South, during which he made 24 appearances and scored five goals, including one at Cappielow.
A product of the Hearts youth academy, Gary scored twice for the Tynecastle club in 25 appearances netted a further two goals in a successful loan spell at Stenhousemuir during the 2014/15 season.
Forward Gary earned four Scotland Under-19 caps in 2013, featuring against Latvia, Belarus, Germany and Switzerland, scoring against the latter.
After making a total of 70 starts and nine substitute appearances over the course of his time on Sinclair Street, in which he netted 14 goals in all competitions, before his contract expired.
Oliver was courted by a number of clubs, including some Ladbrokes Championship rivals and a prominent League of Ireland outfit, but turned down those offers in order to sign up for a third season with the Ton in June 2018.
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