Manchester United goalkeeper David de Gea says West Ham will prove a huge test.
De Gea has warned United about the dangers West Ham will pose.
I believe they have a decent side with some good players who are important to them," he said.
They are on the up at the moment, but we still have bad memories from last season, so we have to be much more switched on right from the off than we were then.
There are three very important points at stake for us to remain up there near the top, and also for the younger lads to keep gaining in confidence. We also want to show that's what we're here for, going away to difficult grounds and going there for the three points."
