Chelsea and Mauricio Pochettino parted company on Tuesday after the club’s hierarchy decided they needed a change. Sources close to Chelsea confirmed to TBR Football that Pochettino was leaving his role as manager, after which the West London giants confirmed the decision. TBR revealed on Tuesday that Chelsea would inform the Argentine of their decision this week and now that has come to pass with the two parties having agreed to part ways. But with many Chelsea fans happy with Pochettino – especially the end of the season which saw him guide the team into Europe – why did the change happen? C…