Liverpool reserve team striker Nathan Eccleston is being investigated by the American-owned club after a controversial post on Twitter about the September 11, 2001 attacks.
In a post on the micro-blogging site, Eccleston, 20, appeared to suggest terrorists weren't responsible for the attacks on New York and Washington 10 years ago which claimed nearly 3,000 lives.
"I ain't going to say attack don't let the media make u believe that was terrorist that did it," Eccleston tweeted before later deleting the post.
The English Premier League club, who are owned by Americas Fenway Sports Group, gave a cool response to the matter.
"The club takes this extremely seriously and senior club officials have informed Nathan Eccleston that we are undertaking an investigation into the circumstances surrounding these postings and will decide on an appropriate course of action," a spokesman told the Liverpool Echo.