Pellegrini has welcomed his former Malaga offside Mario Husillos as the Irons' new director of sport.
"I will work hard with the director of football to try to make a very strong squad," Pellegrini told the club website.
"Maybe a lot of people are thinking about defenders because last season West Ham had the worst defensive record in the league, so we must arrange that, but we must also have a balanced squad and not just a team.
"We have time over the next two months to see which better players we can bring here."
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