It is Manuel Ugarte debut day at Manchester United. Or, at least, it could be. Erik ten Hag confirmed during his pre-Southampton press conference on Friday that Manchester United’s new £42 million deadline day arrival is available to feature at St Mary’s during Saturday’s lunch time kick off. Whether he does, however, remains to be seen. Ten Hag is keen to avoid throwing Ugarte straight in at the deep end, warning it could take weeks or even months before the Uruguay international is fully au fait with life in the Premier League. Then again, with Casemiro’s awful display against Liverpool fres…