The injury also rules him out of both of New Zealand’s FIFA World Cup Play-Off games against Mexico and is likely to keep him out of action for the rest of the month at least.
The timing of the news will be a big blow to Sam Allardyce who has relied on Reid to provide the foundations for the Hammers excellent defensive record this season.
There will be concern that the Hammers fine run of 6 clean sheets in 10 Barclays Premier League games may come to an end this weekend.