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His rugby playing career began at Worcester Warriors (2003-2006). He then moved to the Irish province Ulster and played for Ulster Rugby for 1 season. He then joined Nottingham Rugby for 2 further years. Following this Sam featured for both Leicester Tigers and Wasps in the Aviva A league in different seasons.
McDonald is now furthering his career in London and playing semi professionally.
McDonald is the eldest son of Michellin Starred Chef Patrick McDonald. Who had a TV series on Channel 4 in 1999.