Birmingham have agreed a fee with Luton for striker Rowan Vine.
The Coca-Cola Championship leaders have agreed to pay £2.5million for the 24-year-old, rising to £3million if Blues are promoted to the Barclays Premiership.
Vine, who has scored 14 goals for the struggling Hatters this season, will now speak to Birmingham officials.
Blues joined West Brom in the race to sign former Pompey striker Vine because of injuries to their frontline strikers and had a £2million bid rejected by Luton.
Nicklas Bendtner has suffered an ankle injury which will sideline him for around a month and with Cameron Jerome (Achilles) and long-term casualty Mikael Forssell also out of action, City co-owner David Sullivan and chairman David Gold have answered Bruce's plea in a positive manner.
Bruce said: ''We had the best goalscoring team in the country apart from Manchester United with Gary McSheffrey, Nicklas Bendtner, Cameron Jerome and DJ Campbell. They have been terrific.
''Now we have lost two of them and we have to do something about it.
''Vine has scored three goals against us this season. He is someone we quite like. He is a good player.''
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