Samba is no longer a regular for Bundesliga side Hertha
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Blackburn are close to signing Hertha Berlin's French defender Christopher Samba on a two-and-a-half-year deal.
Samba, 22, had a four-day trial with Rovers earlier this month after falling out of favour at the Olympic Stadium.
Hertha coach Falko Gotz said: "We are waiting for the fax to arrive. It would be great for him if it works out."
Rovers boss Mark Hughes was short of defensive cover following the sale of Lucas Neill to West Ham but has also recruited Liverpool's Stephen Warnock.