Birmingham striker Emile Heskey will have an X-ray to determine the extent of the knee injury suffered during Saturday's Premiership clash at Charlton.
And if the problem proves serious Blues boss Steve Bruce may be forced to look at other options other than Addicks utility player Jason Euell.
Blues have agreed a £1.5million fee for Euell - a substantial amount of which was raised by the sale of Walter Pandiani to Espanyol - although personal terms have still to be discussed.
But Bruce in reality has little money to spend during the January transfer window with the free transfer signing of Chris Sutton his only acquisition to date.
Should Heskey be missing long term, Bruce may have to look for a proven goalscorer. Rangers striker Peter Lovenkrands and Middlesbrough's Jimmy-Floyd Hasselbaink are potential targets.
Bruce said: 'We haven't got a lot of money in the coffers. Jason Euell is one we are interested in but we must bring in the right person. We will see what develops so we need to keep our options open.
'Emile took a knock to the knee during the Charlton game and will undergo an X-ray later today. We will have to keep our fingers crossed it is nothing serious.'
Although not a prolific goalscorer, Heskey has been the one City forward to fulfil his potential this season and a long-term absence would be a massive blow to their hopes of escaping relegation.
Pandiani had netted only two Premiership goals before returning to Spain and Mikael Forssell has looked a shadow of the player who scored 19 goals when on loan from Chelsea two years ago.
Blues assistant manager Eric Black saw Lovenkrands score his 10th goal in the last eight games during Sunday's victory over Motherwell.