Derek McInnes revealed he wrote an apology letter to West Ham star George Parris after being left sickened by an act of racism from football fans in the 1980s.
The former Aberdeen boss was attending a match between the Hammers and his hometown St Mirren as a teenager but the contest was blighted by flashpoint from the stands.
McInnes - speaking in his Mail On Sunday column - called upon the incident ahead Rangers ' visit to Sparta Prague in the Europa League this week.
The clash is the first time the Ibrox side will face a team from the Czech Republic since Glen Kamara was racially abused by Slavia's Ondrej Kudela in last season's competition.
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