Here is a comprehensive list of the Welsh players that have new deals in January.
| Date | Name | Club | Fee |
| 1st January 2019 | Christian Doidge | Forest Green Rovers from Bolton Wanderers | Return from loan |
| 1st January 2019 | Lee Evans | Wigan Athletic from Sheffield United | Undisclosed (confirmation of transfer agreement from Summer) |
| 3rd January 2019 | Tom Bradshaw | Millwall from Barnsley | Undisclosed (confirmation of transfer agreement from Summer) |
| 3rd January 2019 | Aaron Lewis | Doncaster Rovers from Swansea City | Loan |
| 4th January 2019 | Jonny Williams | Charlton Athletic from Crystal Palace | Undisclosed |
| 7th January 2019 | Dave Edwards | Shrewsbury Town from Reading | Free |
| 8th January 2019 | Chris Maxwell | Charlton Athletic from Preston North End | Loan |
| 11th January 2019 | James Collins | Ipswich Town | Free |
| 18th January 2019 | Regan Poole | Newport County from Manchester United | Loan |
| 22nd January 2019 | Chris Mepham | AFC Bournemouth from Brentford | £12m |
| 23rd January 2019 | Mark Harris | Port Vale from Cardiff City | Loan |
| 28th January 2019 | Gethin Jones | Mansfield from Fleetwood Town | Loan |
| 30th January 2019 | Rabbi Matondo | Schalke 04 from Manchester City | £9.6m |
| 31st January 2019 | Sam Vokes | Stoke City from Burnley | Undisclosed |
| 31st January 2019 | Andy King | Derby County from Leicester City | Loan |
| 31st January 2019 | Danny Williams | Cardiff City from Haverfordwest County | Undisclosed |
| 31st January 2019 | Joe Ledley | Free agent | Free |
Behind the Goal 