James McClean was sent a vile letter which appears to celebrate the Bloody Sunday massacre on the date's anniversary.
The Stoke winger shared it on social media which commemorated the deaths of 13 civilians that were shot dead by the British military.
One excerpt reads: "Bloody good laugh, happy anniversary. Enjoy the day, fenian McClean".
The letter also appears to be signed off with the name John Christie, a serial killer across the 1940s and 1950s.
The other side also commends Michael Stone, who was convicted of three counts of murder committed at an IRA funeral in 1988.
It is just the latest incident in a string of racist attacks on the Republic of Ireland international from football supporters.
Captioning the post, McClean wrote: "No name, fasle [sic] address, he's so brave. Rent free in these morons' head".
Bloody Sunday occurred on 30 January 1972 in the Derry area of Northern Ireland, where McClean was born.
It was one of the most significant events of the Troubles after 13 people were shot dead by British soldiers.
McClean has come under fire from fans after refusing to wear the poppy on Remembrance Sunday.
However, the 30-year-old has commended recent events which have dialled down racist abuse towards him.
After meeting with officials from the English FA, Football League, PFA, ‘Kick It Out’ and Staffordshire Police, McClean was impressed with the strides being taken.
“Credit where it’s due,” he said. “They’ve been brilliant recently and the abuse in the last few games has simmered right down.
“That’s something that I thought was probably never going to happen. The fact that it has happened, long may it continue.
"The club (Stoke City) has been brilliant as well - they have really backed me and everyone is singing off the same hymn sheet."
Stoke have been struggling in the Championship this season where they are 21st in the table.
The Potters take on Charlton next in a pivotal clash.