Maurice Edu has claimed he was racially abused by Rangers fans after Tuesday night's Champions League thrashing by Unirea Urziceni.
United States midfielder Edu, 23, played no part in the 4-1 Group G defeat but watched the match at Ibrox and says he was targeted by his own club's supporters as he left the stadium.
Edu wrote a message on his Twitter feed which read: "Not sure what hurt more: result last nite or being racially abused by couple of r own fans as I'm getting in my car."
The Rangers Supporters Trust condemned anyone who might have abused Edu, who has been out all season with a knee injury.
Trust spokesman David Edgar told Press Association Sport: "We would absolutely condemn that if that's the case. These are not Rangers fans and they should be caught and prosecuted to the full extent of the law.''