It’s the first time the two teams have played each other since August 13, 2014, when the Blades hosted Mansfield in a League Cup first round tie when the sides were in League One and League Two respectively.
Ironically, the United manager that night was Nigel Clough, who is now of course the Stags boss.
Andy Butler put the Blades ahead seven minutes into the second half, heading home a Ben Davies corner.
Clough’s relief was short-lived, though, as Alex Fisher brought Mansfield level just four minutes later with a powerful right-foot shot.
The Stags then pushed for a winner, with Blades goalkeeper Mark Howard keeping out a Sam Clucas effort.
But Marc McNulty popped up with a last-gasp winner to delight Clough with four minutes left and set up a clash with West Ham in their second round tie.
Here, we look at who played for Mansfield that day and then where their careers took them after leaving Stags, with some of them pictured during the game itself.
1. Sascha Studer - Goalkeeper
Swiss goalkeeper who played 17 times for Stags before retiring early from the game and working in the financial sector in his home country. Photo: Clive Brunskill
2. Rob Taylor - Defender
Arrived after several years at Port Vale but only played 16 times before moving to Tranmere and Kidderminster. Now lives in Australia and has degree in sports science. Photo: .
3. Martin Riley - Defender
Riley had two years with Stags before moving to Tranmere and then into non-league before retiring in 2024. Photo: .
4. Jamie McGuire - Midfielder
McGuire had four years with Mansfield before retiring in 2017. Coached in the Stags academy and also scouted for the club. Photo: .