Obiang joined the east London club this summer but did not play for West Ham against Andorran side Lusitanos in their European qualifier.
In the event, he wasn't needed as the Hammers beat Lusitanos 3-0, thanks to a double from Diafra Sakho and a goal from captain for the night James Tomkins.
There were several notable performances, such as that of Mauro Zarate - and 16-year-old Reece Oxford.
Obiang, meanwhile, took to social media during the West Ham game with an excited tweet. Indeed, the 23-year-old can't wait to turn out for the Hammers:
The midfielder watched on from afar as Slaven Bilic's side were victorious.
West Ham now have a huge advantage going into next week's second leg, meaning their first Europa League hurdle is a step towards completion.
As the competition progresses, if West Ham are still involved, the likes of Obiang and another summer-signing in Dimitri Payet will no doubt be of huge use to Bilic and co.
*article edited for inaccuracies