Manchester United quality is better than both teams they'll face. I think they'll likely win matches over Grimsby, even if it's only by a narrow scores 1-0. In the EPL match, I think Burnley can take an advantages to get a point from United. A draw is still a reasonable result for Burnley. But if United fail to win these two matches, I think they should immediately make the decision to change their coach again, before too late.