With figures gathered from Transfermarkt, here's a look at how both club's average home support over the last decade...
1. 2009/10 - Sheffield Wednesday
Division: Championship. Average home attendance: 23,179. (Photo by David Rogers/Getty Images) Photo: David Rogers
2. 2009/10 - Sheffield United
Division: Championship. Average home attendance: 25,120. (Photo by Stu Forster/Getty Images) Photo: Stu Forster
3. 2010/11 - Sheffield United
Division: Championship. Average home attendance: 20,632. (Photo by Stu Forster/Getty Images) Photo: Stu Forster
4. 2010/11 - Sheffield Wednesday
Division: League One. Average home attendance: 17,817. (Photo by Clive Brunskill/Getty Images) Photo: Clive Brunskill