The 25-year-old joined Premier League outfit West Ham from Championship side Nottingham Forest on transfer deadline day.
Antonio was one of the best players in the Championship last season, and he will be expected to hit the ground running at the Hammers.
The former Sheffield Wednesday player could make his debut for Slaven Bilic’s side this evening when they take on Newcastle United at the Boleyn Ground.
Despite his obvious quality, Antonio is not guaranteed a place in West Ham’s starting line-up, but he is ready to prove himself in the Premier League.
“Since I was a kid, it has always been my dream to kick a ball in the Premier League and it could happen today,” the former Reading man told West Ham’s official website.
“I am a player who wants competition and wants to get better. Every team I’ve gone to I’ve had to prove that I’m the best in that position at the club and it’ll be no different here.
"There is good competition, but I want to thrive and try to be the person who is first on that sheet.”
Antonio scored 14 goals and created 62 chances in 46 Championship games during the 2014-15 campaign.
The 25-year-old had a pass accuracy of 60% and a shot accuracy of 44%, and won 151 headers, 104 dribbles and 42 tackles.
Antonio scored two goals and created nine chances in four Championship matches for the Reds this campaign before his move to West Ham in the summer transfer window.