Birmingham City have made a £2.5 million bid for Lokomotiv Moscow striker Garry O'Connor.
Birmingham manager Steve Bruce has now followed up his initial interest with an offer which could rise to £3million should newly-promoted City avoid relegation.
A source in Russia confirmed: "A bid has been received from Birmingham City for Garry O'Connor which is being considered."
O'Connor moved to Russia last year in a £1.6million switch from Hibernian, but has failed to settle.