The Hammers have a number of former Dons in their squad, as the cash-strapped club have been forced to sell off their top stars to ease their plight.
The Division One's bottom club now face Alan Pardew's promotion-chasers on Tuesday night and their old boys pose a real threat.
19-year-old Reo-Coker says that he still has a lot of affection for Wimbledon and would not celebrate scoring against them.
"I wouldn't celebrate if I scored a goal but I have to concentrate on my own career and the other ex-Wimbledon lads feel the same way," said Reo-Coker.
"We grew up at Dons and it was a great club to be at.
"This is a new chapter in our lives - we are West Ham players now and will be looking for three points."
Pardew has also signed former Dons Adam Nowland and Jobi McAnuff in a triple raid during the winter, while striker David Connolly is also a former Wimbledon marksman.
