A Scotland Under-19 cap, Ross had spells at Motherwell, Partick Thistle and Dunfermline Athletic before joining Morton in January 2015.
His injury-time winner against Ayr United in March 2015 clinched a crucial three points on the way to the League One title, and Ross added five more goals last season, including winners against Queen of the South and Livingston.
A creative midfielder, he is a set-piece specialist and has dead-ball expertise is a valuable source of goals and assists for his side.
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