Ivelin Popov has begun trials with Blackburn Rovers.
The 22-year-old, who plays for Litex Lovech, can play as a support striker or a right winger, and Rovers will run the rule over him over the next few days as they continue their hunt for more firepower options.
Rovers don't expect any additional investment to be received this month and Allardyce is continuing his efforts in the transfer market on the limited budget available.
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