Auston Trusty has expressed his bemusement about the negative reaction to Wilfried Nancy using a tactics board in the Parkhead dugout and revealed that Celtic have used modern day coaching aids to help them win matches for years.

Nancy has been ridiculed on social media since Sky Sports cameras showed him moving coloured counters about a magnetic board during the William Hill Premiership defeat to Hearts in the East End on Sunday afternoon.

But United States internationalist Trusty, who lined up on the right of a back three in the 3-4-3 system which the MLS Coach of the Year switched to on his debut, is baffled by the outcry there has been to the Frenchman’s approach to his work.

The former Arsenal and Sheffield United centre-half believes that clubs must use every tool at their dispo

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