The New Zealand international defender picked up a hamstring injury in the Premier League clash against London rivals Chelsea at the Boleyn Ground last week.
Reid will return to training next week, meaning that he will miss out on the Premier League encounter against Arsenal at the Emirates Stadium.
Sam Allardyce’s West Ham side will also be without striker Carlton Cole, who picked up a hamstring injury against Tottenham Hotspur at White Hart Lane on February 22.
The 31-year-old striker will also return to training with his teammates next week, and he, too, will be unavailable for the London derby against Arsenal.
Former Liverpool striker Andy Carroll is a long-term injury concern, and, according to West Ham’s official website, the England international “will start walking normally” only on March 17.
How will these injuries affect Arsenal?
Arsenal need not worry about Cole, as he was unlikely to start against them even if he were fit and available.
The good news for Arsene Wenger’s side is that Reid will miss the game. The 26-year-old central defender is one of the best players in the West Ham squad, and his absence will certainly help the Arsenal attackers.
Reid’s importance to the West Ham team is demonstrated by the fact that he has featured in no fewer than 25 Premier League matches so far this season.
In those games, the 26-year-old has scored one goal and created seven chances. The former Midtjylland has a pass accuracy of 80% and has won 58% of the duels.
Without Reid in defence, Sam Allardyce’s side will be weaker, and this is only going to help Arsenal.