The England Under-21 winger, who joined Bundesliga club Hoffenheim on loan from Tottenham Hotspur last month, posted the screenshot on his Instagram story.
He wrote at the top of the screenshot: “Honestly unbelievable. The craziest thing is I’m not even surprised anymore. Disgusting.”
“We are driven by inclusion and equality for all and nobody should have to endure such repulsive abuse,” it added.
In its statement, posted above the screenshot of blurred out racist terms directed at Sessegnon, the club wrote: “Today, our player @RyanSessegnon was the target of horrific online racist abuse.
“#TSG stands for tolerance, integration and respect. We reject all forms of racism, discrimination and exclusion and say #NoToRacism!”
Social media companies such as Instagram, which is owned by Facebook, have been criticized for the ways minority users are targeted with abuse on their platforms. Instagram was not immediately available for comment when contacted by CNN.
In October, Facebook and Kick It Out launched ‘Take A Stand,’ a new joint initiative intended to educate fans on how to call out racism, both online and offline.
The new initiative includes an “anti-discrimination toolkit,” which fans can access through an automated WhatsApp service and receive information on how to tackle and report discrimination.
Facebook recently announced new tools, such as automatically hiding comments similar to those already reported and direct message controls, that it hopes will help reduce online abuse.