Johnson completed the move to Blues after holding talks with City boss Steve Bruce today.
Johnson's agent said: "Damien has agreed to join Birmingham City with immediate effect. Damien has signed a three-and-a-half-year contract."
Birmingham have beaten Nottingham Forest to the signature of the 23-year-old, who was told by Graeme Souness that his contract at Ewood Park would not be renewed in the summer.
It is expected that a nominal fee will be agreed between the two clubs, as Johnson is under the age of 24 and is a product of Rovers' academy system.
| Name | Damien Johnson |
| Date Of Birth | 18 November 1968 |
| Place Of Birth | Blackburn |
| National Team | Northern Ireland |
| Height | 5 Ft 9 In |
| Weight | 10 St 0 Lb |
| Normal Position | Midfielder |
| Team | From | To | Terms / From | Fee |
| Nottm Forest | 28 Jan 1998 | Loan | ||
| Blackburn | 1 Aug 1997 | Trainee |
| Career History | League | FA Cup | Lg Cup | Other | ||||||||
| Team | AP | SB | GL | AP | SB | GL | AP | SB | GL | AP | SB | GL |
| Nottm Forest | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 |
| Blackburn | 43 | 16 | 3 | 3 | 4 | 0 | 12 | 3 | 1 | 0 | 0 | 0 |
| Performance | Goals | Booking | Team Results | Strike | |||||
| Season | Apps | Home | Away | Home | Away | Wins | Losses | Draws | Rate |
| 2001/2002 | 0.17 | ||||||||
| 2000/2001 | 0.00 | ||||||||
| 1999/2000 | 0.04 | ||||||||
| 1998/1999 | 0.04 | ||||||||
| 1997/1998 | 0.00 | ||||||||