Hampshire Police are investigating racist abuse suffered by Southampton's Alex Jankewitz on social media after Tuesday's (2) 9-0 defeat at Manchester United.
The 19-year-old was sent off in the second minute of the game at Old Trafford on his first Premier League start.
A spokesperson for Hampshire Police told Sky Sports News:
"We are aware of reports of racist abuse on social media directed at a Southampton Football Club player.
"We are liaising with the club and enquiries into this matter are ongoing."
A club statement said:
"Southampton Football Club can confirm that it has identified a number of posts on social media directing racial abuse at our 19-year-old midfielder Alex Jankewitz, following last night's result at Manchester United.
"Abuse of any form will never be tolerated at Southampton. Our club prides itself on its inclusive nature, and supporters who stoop to such abhorrent and archaic standards are not welcome as Southampton supporters, or anywhere else within football.
"The club will continue to fight every day to remove such people from our sport and our community in order to protect our players, our staff, Southampton fans and football supporters around the world who recognise and celebrate the diversity that makes football special.
"The club is passing on all abusive messages to Hampshire Police and hope they are able to permanently remove those individuals from our football community."