The Football Association is looking into the alleged Nazi salute made by Crystal Palace goalkeeper Wayne Hennessey, Press Association Sport understands.
Wales international Hennessey appeared to be making the gesture in a picture posted on Instagram by Palace's German midfielder Max Meyer as the players celebrated their FA Cup win against Grimsby on Saturday night.
Hennessey is seen in the background of a group photograph posted on Meyer's Instagram story, which has subsequently expired.
The 31-year-old has denied he was making a Nazi salute, claiming on Twitter that he was calling out to the person taking the photograph.
Nevertheless the FA is now looking into the matter along with Crystal Palace.
"Yesterday (Sunday) evening I had a meal with my team-mates and we had a group photograph," Hennessey said in response to the matter on Twitter.
"I waved and shouted at the person taking the picture to get on with it and at the same time put my hand over my mouth to make the sound carry.
"It's been brought to my attention that frozen in a moment by the camera this looks like I am making a completely inappropriate type of salute.
"I can assure everyone I would never ever do that and any resemblance to that kind of gesture is absolutely coincidental. Love and peace. Wayne."