Manchester United find new problem but Mason Greenwood lesson learnt in West Ham win

Mason Greenwood must replace Anthony Martial

For the most part, Anthony Martial was awful against West Ham.

And when Greenwood replaced the France international down the middle, the 19-year-old proved a big point.

The teenager showed predatory instincts to give United all three points, spinning his man and firing home in style before Rashford added gloss late on.

Martial is a good player.

But Greenwood looks deadlier down the middle and must be deployed there more often.