According to BBC
The 25-year-old has been in fantastic form since his summer arrival to Upton Park, forming a partnership with fellow new-boy Diafra Sakho in attack that threatened to push West Ham into a European place. But the two forwards have endured a gruelling campaign, and the club as a while are starting to show fatigue from their earlier efforts.
Following the injury, West Ham now don’t have many available strikers to them for their Arsenal meeting, with Andy Carroll out of action for the rest of the season with a knee problem, while Carlton Cole was previously also suffering. Such badly-timed injury woes led manager Sam Allardyce to sign Nene as an emergency buy to give the London some options in attack, but they will miss Valencia. He is said to have deeply cut his toe from a broken cup at his house.
It’s unknown how long the Ecuadorian international will be out of action for, but Allardyce has ruled him out of the Arsenal game, and is hoping he can return after that.
“He had an accident at home and has cut his big toe quite severely. It has been stitched. We think it will be too soon for him be considered for the game at Arsenal. It was a freak accident at a time when we could have done without it due to our lack of available strikers. Our lack of goal scoring power is a worry. Not having alternatives to use is concerning going into the last 10 games,” he said.
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