The Nigeria winger arrived at the Boleyn Ground on a season-long loan from Chelsea on transfer deadline day.
The Hammers were one of the busiest clubs on all summer, signing 12 players in total with a net spend of around £25-30 million including loan fees.
The east Londoners are widely considered to have done some of the best business of the summer overall, many citing the signing of Moses as a case in point.
West Ham supporters will be putting their rivalry with Chelsea to one side as they get behind Moses in the hope of a successful season for player and club.
But should not get too attached. Despite spending most of his Chelsea career so far out on loan at Stoke City and Liverpool, the pacy star was handed a brand new deal by Chelsea before completing his loan move across London.
Ambitions beyond West Ham?
“Chelsea is a great club, I’d love to play there," Moses told the Evening Standard.
"But the most important thing is to play, so I go wherever I can play.
“The most important thing for me is playing football. That’s all I want, to play. That is what motivates me."
West Ham players and fans just happy Moses chose them
While Moses may be looking forward to just playing some football, his presence already has West Ham's players licking their lips in anticipation.
New captain Mark Noble and James Tomkins have already hailed his signing as brilliant business for the club.
And that is because he brings so much to the team including goals, assists and plenty of hard work.
His presence will give players like Noble, Dimitri Payet and Alex Song, when he is fit, far greater options when he has the ball this season.
Extra qualities that were missing
Last season, the likes of Song were often ready to play a killer pass but did not have team-mates of sufficient quality to read what he was trying to do.
And for Slaven Bilic's strikers like Diafra Sakho, Andy Carroll and Nikica Jelavic, Moses should quite literally mean goals.
The wing man is very unselfish and, when he's not tracking back to help out his team-mates, he will be terrorising his opposing full-back with a view to supplying the strikers with ammunition to get their goals.
The new West Ham star is also not afraid to have a go himself, often coming up with the odd cracker when he cuts inside off the wing.