Chelsea are pushing to completing a deal that will see Rennes goalkeeper Edouard Mendy.
The FA Cup finalists previously tabled a bid to the Breton side for €20 million (£18m/$24m) but found the French club stubborn in their resistance to letting their No.1 depart for such a fee.
With a desire to complete a deal this week, they are willing to push for any fee up to €28m before bonuses in order to reach an agreement.
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The Blues have been following the shot-stopper for an extended period and were also linked with Lille's Mike Maignan for the role.