The 23-year-old midfielder sent a message to West Ham fans on social media.
The former Sampdoria man had already turned out for West Ham during pre-season but got his first taste of competitive action with the Irons against Leicester City.
And, despite the 2-1 loss to the Foxes, Obiang was a standout performer for the hosts, with Julian Dicks one of many to praise his contribution after the game.
|V Leicester||Tackles||Dribbles||Minutes Played|
As Opta stats show, 45 minutes was enough for Obiang to win as many tackles as any other West Ham player against Leicester, while he also won three dribbles - more than anyone including the creative duo of Dimitri Payet and Mauro Zarate.
There were few other positives for the Hammers faithful on a day their 2-0 win at Arsenal became but a distant memory, with referee Anthony Taylor frustrating supporters but the display of Slaven Bilic's side as a whole also disappointing.
Once Obiang is fully settled, he should prove an astute addition to West Ham's squad, although the general consensus is that the east London club still require another midfielder.