"Not yet," the former Toro Rosso driver, and 2012 Pirelli tester, told the AS newspaper when asked if he is now ready to announce the news.
"We may not be able to communicate about 2013 until January. It's also possible that it will be in the coming days."
Alguersuari admitted to a certain frustration about the current situation in F1, with many talented and experienced drivers fighting against so-called 'pay drivers' for seats.
"Fortunately or unfortunately, F1 is not Motogp. If Stoner is injured, there is no substitute who can match Pedrosa or Lorenzo.
"But in F1 there are ten applicants for a single seat. Merit, talent, past performance and experience are only part of what is needed," he said.