Brazilian Felipe Nasr, and his sponsor Banco do Brasil, have joined Williams.
GP2 frontrunner Nasr, 22, is the British team's new reserve driver, and Williams said he will take part in five Friday morning practice sessions this year.
In a separate media statement, it was announced that the logos of Banco do Brasil, the largest bank in Latin America, will appear on the FW36's engine cover.
"I can't wait to get behind the wheel of a formula one car for the first time in Bahrain," said Nasr.
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