Red Bull have issued Daniel Ricciardo an August contract deadline before they start looking elsewhere for a 2019 driver, with Christian Horner admitting Carlos Sainz would be leading the queue. Ricciardo, out of contract at the end of the season, has yet to commit his future to Red Bull and, amid links with Ferrari and Mercedes, said his Chinese GP win would not be enough in isolation to convince him to stay. Ricciardo sends Red Bull warningWhen's the Azerbaijan GP on Sky? The Australian wants to keep his options open for as long as possible as he waits to see which car will give him the best title-winning opportunity, but Red Bull say they need to know his plans sooner rather than later....
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