Gloucestershire captain Jon Lewis accused Northants of treating England spinner Monty Panesar 'disgracefully' because of the number of South African players in the Steelbacks side.
He was one of a number of players who have raised the issue as a threat to the development of English cricket.
But Tagg, whose side fielded six South African-born players in the defeat of Glamorgan Dragons at the County Ground on Sunday, dismissed the concerns.
"The fans don't give a monkey's where their players are from," said Tagg after the victory that edged Steelbacks closer to a quarter-final spot in the Twenty20 Cup.
"They just want to see their team winning."
Lewis: Northants' treatment of Panesar is 'disgraceful' - click here
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