By Jack Gallagher Erik ten Hag has revealed that Manchester United’s sense of “injustice” around Brentford’s opening goal spurred them on to a crucial 2-1 win on Saturday. Brentford opened the scoring in the sixth minute of additional time at the end of the first-half in controversial fashion. The Bees took advantage of Matthijs de Ligt being forced off temporarily after receiving treatment on the field for a gash on his head to take the lead through Ethan Pinnock – the defender rising highest from a corner kick to nod home the opener. After a disappointing first-half, Man Utd came out firing …