Erik ten Hag’s midfield hasn’t quite worked this season with injuries and an ageing Casemiro proving costly to Manchester United. This campaign has had a series of issues for Erik ten Hag who has seen his side regress from the one which won the League Cup and finished third last season. This has been caused by numerous factors with injuries playing a catastrophic role, along with some players simply not being cut out for it anymore. One player who has been out injured for what feels like the entire season is £55m man Mason Mount who only joined last summer but has yet to really arrive at the c…