West Ham have failed with two attempts to sign Ryan Bertrand from Chelsea on loan as they look to solve their left-back problem.
The Blues considered allowing Bertrand to move to Upton Park until the end of the season but manager Rafael Benitez values the 23-year-old’s versatility and wants to keep him as a back-up to Ashley Cole.
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Blackburn defender Martin Olsson is also a target for the east London club but their focus has been on Bertrand, who has made 21 appearances in all competitions for Chelsea this season.
West Ham were able to make a move for Bertrand after Yossi Benayoun returned to Chelsea at the start of the month following an ill-fated loan spell at Upton Park. Premier League rules dictate that the Hammers would not have been able to sign two players on loan from the same club.
But Chelsea refused to agree a deal for the England international despite his long-term future at the club being uncertain after Ashley Cole signed a one-year contract extension and with the Blues closely tracking Southampton teenager Luke Shaw.
Joey O’Brien has been West Ham’s first-choice left-back for most of the campaign so far but Allardyce wants to bolster his back four, while he is short of alternatives due to injuries to George McCartney and now Potts.
West Ham confirmed on Thursday that Potts will undergo scans and further assessment after he was knocked unconscious at the Emirates Stadium and required treatment on the pitch for more than 10 minutes.
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