The chances of Casemiro leaving Manchester United in the January transfer window have been explained, according to reports. Manchester United midfielder Casemiro has had a tough time of things this season and remains out injured for the Red Devils following an injury he suffered on international duty for Brazil. His struggles early on in the season have meant that teenage sensation Kobbie Mainoo has lined up as the deepest midfielder for United and has performed superbly well for the Red Devils this season. As a result, the Brazilian may well find it hard to come back into the first-team fold,…