The Argentine forward arrived at Stamford Bridge after the Blues had agreed a sum believed to be in the region of £3.5m with Chilean club Audax Italiano.
The towering hitman spent a season-long loan at Blackburn Rovers, but managed to score only once in 22 appearances for Sam Allardyce's men.
Now, The Mirror reports that Trotters boss Owen Coyle is intent on bringing the striker to the Reebok for a sum of £2m.
It is also said that Chelsea could be willing to make a loss by selling the out-of-favour forward to make way for new signings.
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