| Season | Team | Competition | MP | G | A | Rating | ||
|---|---|---|---|---|---|---|---|---|
| 2024/2025 | Macclesfield | Non League Premier | 0 | 0 | 0 | 0 | 0 | – |
| 2021/2022 | Tranmere Rovers | League Two | 3 | 0 | 0 | 0 | 0 | 6.4 |
| 2020/2021 | Fleetwood Town | League One | 24 | 0 | 1 | 4 | 0 | 6.7 |
| 2019/2020 | ADO Den Haag | Eredivisie | 5 | 0 | 0 | 2 | 0 | 6.5 |
| 2019/2020 | Stoke City | Championship | 6 | 0 | 0 | 0 | 0 | 6.8 |
| 2018/2019 | Sheffield United | Championship | 36 | 6 | 6 | 2 | 0 | 7.2 |
| 2017/2018 | Sheffield United | Championship | 36 | 3 | 9 | 3 | 0 | 7.1 |
| 2016/2017 | Sheffield United | League One | 39 | 6 | 0 | 3 | 0 | – |
| 2015/2016 | Burton Albion | League One | 45 | 8 | 0 | 2 | 0 | – |
| 2014/2015 | Chesterfield | League One | 3 | 0 | 0 | 0 | 0 | – |
| 2014/2015 | Birmingham City | Championship | 4 | 0 | 0 | 0 | 0 | – |
| 2013/2014 | Doncaster Rovers | Championship | 36 | 2 | 0 | 3 | 0 | – |
| 2012/2013 | Scunthorpe United | League One | 43 | 5 | 0 | 4 | 0 | – |
| 2011/2012 | Scunthorpe United | League One | 37 | 2 | 0 | 2 | 1 | – |
| 2010/2011 | Scunthorpe United | Championship | 22 | 1 | 0 | 2 | 0 | – |
| 2010/2011 | Morecambe | League Two | 22 | 0 | 0 | 1 | 0 | – |
| 2009/2010 | Morecambe | League Two | 37 | 5 | 0 | 4 | 1 | – |
| Total | 398 | 38 | 16 | 32 | 2 | – | ||
| Date | From | To | Type | |
|---|---|---|---|---|
| 01 Aug 2022 | Tranmere | Macclesfield | Free | |
| - | Fleetwood | Tranmere | Free | |
| 07 Jan 2020 | ADO | Fleetwood | N/A | |
| - | Sheff Utd | ADO | Loan | |
| 08 Aug 2019 | Sheff Utd | Stoke | Loan | |
| 07 Jan 2016 | Birmingham | Sheff Utd | N/A | |
| 07 Mar 2015 | Birmingham | Burton Albion | Loan | |
| 02 Feb 2015 | Birmingham | Chesterfield | Loan | |
| 07 Jan 2014 | Doncaster | Birmingham | N/A | |
| - | Scunthorpe | Doncaster | N/A | |
| - | Morecambe | Scunthorpe | N/A |
M. Duffy career history shows progression across clubs and competitions, including club timeline, national team appearances and overall career totals.