Baros, 26, joins from French side Lyon and Pompey have also secured an option to buy thr Czech Republic forward if the move is a success.
Baros passed a medical at Fratton Park on Sunday and Portsmouth manager Harry Redknapp told the club´s website, portsmouthfc.co.uk: "It´s a terrific opportunity to have a look at him. It´s a loan deal until the end of the season and then we´ll see how it goes from there."
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