The football-mad four-year-old from Mallusk joined Celtic on the pitch at Parkhead on Tuesday night - acting as mascot for its Uefa Champions League second qualifying round tie against Cliftonville.
In 2011 Oscar was diagnosed with neuroblastoma.
His story captured the hearts of Celtic fans who raised thousands of pounds for his charity. This year he was given the all-clear.
The Glaswegian Hoops hosted the Reds in the return leg of the Champions League qualifier.
Despite a valiant effort, Celtic eased through to their Champions League qualifying tie with a comfortable 3 - 0 win over the north Belfast side.
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