The FA apologised to Nigerian-born Aluko on Wednesday for racially discriminatory remarks by former England manager Mark Sampson.
"The FA can confirm we are investigating England Women goalkeeping coach Lee Kendall following new evidence that came to light on Wednesday alleging unacceptable behaviour towards Eniola Aluko during an England camp," the ruling body said in a statement.
Aluko said the 36-year-old Kendall, who took the job in 2014, had spoken to her in a fake Caribbean accent.
News that makes sense
Your trusted source for staying up-to-date with the world around you. Get free daily news updates and analysis, straight to your inbox.
"I don't think he meant it maliciously," Aluko said in evidence given to the Department of Digital, Culture, Media and Sport select committee on Wednesday. "He may not have been aware of how annoying it got.
"I'm not Caribbean, I'm of African descent. I thought it was another example of an ignorant mindset and behaviour towards me."
FA officials later admitted to failings as they came under fire from MPs at the four-hour parliamentary inquiry in which they were also accused by experienced international Aluko of having had an agenda to protect Sampson and their reputation.
Sampson was sacked by the FA last month for "inappropriate and unacceptable" behaviour in a previous job. He has denied the allegations and been cleared of discrimination by two inquiries.
(Reporting by Ed Osmond; Editing by Matthew Mpoke Bigg)
