The Nigeria-born attacker was the victim of racist comments on social networking site Facebook, which have now been deleted from his page.
The Tyneside club have released a statement of support for their longest-serving player, and have alerted the correct authorities.
“We have liaised with Northumbria Police and the matter is now in their hands. We have a zero-tolerance approach to racism and will always seek to take the strongest possible action,” a spokesperson told reporters.
Northumbria police have also confirmed that they have started an investigation, and will look to track where the messages originated.
“We have received a report of racist comments made on Facebook, on which we’re working closely with Newcastle United.
“Northumbria Police take all reports of racist abuse very seriously and inquiries are being conducted,” Sky Sports state.
Ameobi’s brother Sammy was also the subject of racist remarks on Twitter at the tailend of 2011.
By Gareth McKnight