The Finland international striker will be out of contract at the end of June although Blues do have a two-year option on his contract.
However, with the club being relegated to the Championship Blues are going to struggle to hold onto their highest-paid players.
Goalkeeper Maik Taylor's deal at St Andrew's is also due to expire at the end of June.
Media reports have suggested that Liverpool are interested in taking the Northern Ireland international to Anfield as goalkeeping cover.