The 21-year old winger has finally had his future sorted after plenty of talk regarding a move to Stamford Bridge with the Blues and Latics eventually agreeing a fee of £9million.
Now that he has made the move to West London, Moses is looking forward to playing for the European champions alongside some top quality players.
"When I first heard that Chelsea had come in for me I was surprised, but I had a call from my agent saying they were really interested in me and what did I think," he told the club's official website.
"I said they are the European champions and anyone would like to play there and now that everything is sorted, I am delighted to be here.
"I am happy to come back to London as I grew up here and it is a great honour to play for the club that won the Champions League."
He added: "There are a lot of world-class players here and I am here to do my best for the team and to help them win more trophies.
"The club has done well for the past few years, they have achieved a lot, and for me to be able to play with these world-class players, I am delighted to be here."