(Reuters) - Manchester City have not yet decided if they will sign a new striker to replace Sergio Aguero, manager Pep Guardiola said, with the summer transfer window set to close next week. British media have heavily linked Premier League champions City with Tottenham Hotspur striker Harry Kane, but Tottenham chairman Daniel Levy has said the England captain is not for sale. With the Premier League transfer window scheduled to shut on Aug. 31, time is running out for City to make new signings. "When we decided not to extend the contract of Sergio Aguero and people asked what we would do, I said many times it would depend on the market," Guardiola said. City, who thrashed newcomers Norwich City 5-0 last weekend, host Arsenal on Saturday.