By Michael Graham David de Gea has identified two key reasons that he says are responsible for Manchester United’s improvement this season. The Red Devils have been stuck in an apparent decline for a few years now but they beat West Ham 1-0 on Sunday to exted their recent unbeaten run to eight matches. De Gea was a key player in the win, but he believes that it is what the team is doing without the ball, not with it, that is providing the platform for progress under new boss Erik ten Hag. “We are pressing well and recovering the ball well high up the pitch,” de Gea explained. “We conceded some…