Steve Cooper made a decision involving Gianni Vio shortly before he left Nottingham Forest – and now it’s proving a costly one. The head coach who led Forest to the Premier League departed the club in December after over two years in charge. Shortly before his departure, he turned down the chance to work with set-piece guru Vio and now it could prove fatal for Forest. So what was the situation involving Vio, Forest and Cooper? Let’s take a closer look… Steve Cooper decision on Gianni Vio proving costly for ForestWell, it was widely reported that Evangelos Marinakis had identified Antonio Conte…