Shaw questions Man Uniteds commitment after Wolves defeat
A fourth league defeat in 10 games at Old Trafford this season leaves United still languishing in seventh, four points adrift of the top four.
United was expected to mount a title challenge this season after adding Cristiano Ronaldo, Jadon Sancho and Raphael Varane to a squad that finished second to Manchester City last season.
But the Red Devils are 22 points behind City at the top of the table and closer to rock bottom Norwich.
Ole Gunnar Solskjaer paid for a dreadful run of results when he was sacked as manager in November.