Romania's Fed Cup captain, the former world number one and Grand Slam champion Ilie Nastase, has been heard making a derogatory comment about Serena Williams' unborn child.
As Romanian player Simona Halep was answering a question in English about Williams' pregnancy at Friday's Fed Cup draw in Constanta, the 70-year-old turned to one of his other team members and added in Romanian: "Let's see what colour it has. Chocolate with milk?"
A spokesman for the International Tennis Federation has told the BBC they are aware of the comments and has begun an immediate investigation.
"The ITF does not tolerate discriminatory and offensive language and behaviour of any kind," the statement reads.