[9] Cardiff 3-1 Appelgren/ Rosenholm [20] 2021-04-05 06:00
Stadium: Cardiff City Stadium Round: 4
Referee: James Linington Home Manager: Michael Joseph McCarthy Away Manager: Gary Rowett
Head to Head
| England Championship | 2021/01/30 15:00 | Cardiff v Millwall | D | 1-1 |
| England Championship | 2020/11/21 15:00 | Millwall v Cardiff | D | 1-1 |
| England Championship | 2019/12/26 15:00 | Cardiff v Millwall | D | 1-1 |
| England Championship | 2019/10/22 18:45 | Millwall v Cardiff | D | 2-2 |
| England Championship | 2018/02/09 19:45 | Millwall v Cardiff | D | 1-1 |
| England Championship | 2017/10/28 14:00 | Cardiff v Millwall | D | 0-0 |
| England Championship | 2015/04/18 14:00 | Cardiff v Millwall | D | 0-0 |
| England Championship | 2014/10/25 11:15 | Millwall v Cardiff | L | 1-0 |
Home History
| England Championship | 2021/04/02 14:00 | Cardiff v Nottm Forest | L | 0-1 |
| England Championship | 2021/03/20 17:30 | Swansea v Cardiff | W | 0-1 |
| England Championship | 2021/03/16 19:00 | Cardiff v Stoke | D | 0-0 |
| England Championship | 2021/03/13 15:00 | Cardiff v Watford | L | 1-2 |
| England Championship | 2021/03/05 19:45 | Huddersfield v Cardiff | D | 0-0 |
| England Championship | 2021/03/02 19:00 | Cardiff v Derby | W | 4-0 |
| England Championship | 2021/02/27 15:00 | Middlesbrough v Cardiff | D | 1-1 |
| England Championship | 2021/02/24 19:45 | Bournemouth v Cardiff | W | 1-2 |
Away History
| England Championship | 2021/04/02 14:00 | Millwall v Rotherham | W | 1-0 |
| England Championship | 2021/03/20 15:00 | Millwall v Middlesbrough | W | 1-0 |
| England Championship | 2021/03/17 19:00 | QPR v Millwall | L | 3-2 |
| England Championship | 2021/03/13 15:00 | Derby v Millwall | W | 0-1 |
| England Championship | 2021/03/06 15:00 | Millwall v Blackburn | L | 0-2 |
| England Championship | 2021/03/02 19:00 | Millwall v Preston | W | 2-1 |
| England Championship | 2021/02/27 15:00 | Barnsley v Millwall | L | 2-1 |
| England Championship | 2021/02/23 19:45 | Luton v Millwall | D | 1-1 |