Paul Telfer, Paul Elliot ,Lee Naylor, Peter Latchford,Tony Warner,Ian Wright,Chris Sutton,Lee Martin,Alan Stubbs,
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four players
Juan Sebastien Veron
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The Sweedish striker Henrick Larson played many years for Celtic in Scotland, but played only a year for Manchester United.
as per my knowldge i only see 3 player have played for Celtic and Southampton here is the list of three. Victor Wanyama Virgil van Dijk Fraser Forster
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Chris Sutton played for several clubs during his professional career, including Norwich City, Celtic, Blackburn Rovers, Chelsea, and Birmingham City. He began his career at Norwich City in 1992 and had notable spells at Celtic and Blackburn Rovers. In total, he played for five clubs in the English and Scottish leagues.