West Ham's Jonathan Spector will miss the next two matches after suffering concussion in the clash with Sunderland on the weekend.

The US international was involved in a challenge in the air and left unconscious and had to be stretchered off the pitch.

"He lost a little a bit of consciousness and he lost his short-term memory. He is fine and they are confident it is not going to be a big problem. He couldn't remember much of it but he was fine," said Hammers manager Gianfranco Zola.