The 23-year-old midfielder has joined the Hammers from Italian club Sampdoria, as announced on the club’s official website earlier this week.
The former Spain Under-21 international has put pen to paper on a four-year deal and has become the London outfit’s second signing of the summer after goalkeeper Darren Randolph.
Collins is delighted to have the Spaniard as his teammate for next season, and believes that he will prove himself at the Boleyn Ground.
“We have been busy in the transfer market as well and it is massive for us to have someone like Pedro Obiang coming into the club,” the 31-year-old Wales international wrote on West Ham’s official website. “It is a great signing and he is a young, talented player so it will only add to the squad.
“I think we will lose a few out of contract lads so we need to make a few signings and that is a great start.”
Obiang was one of the best players for Sampdoria in the recently concluded 2014-15 Serie A campaign.
The Spanish midfielder scored three goals and created 28 chances in 33 league appearances.
The 23-year-old had a pass accuracy of 82% and a shot accuracy of 52%, and won 22 headers, 26 dribbles and 76 tackles.