Obinna, who signed on a season-long loan from Inter Milan last month, says it is only a matter of time before the team start winning games, and maintains that pulling off a shock result against their London rivals on Saturday is a possibility.
"The manager is working on that and we just need a little time for the players to come together," the Nigerian told whufc.com.
"We need to work with each other and understand our strengths. Why can't we do something against Chelsea?
"Everything is possible in football. You can never tell. Anything can happen in 90 minutes."