The push for a new striker comes amid confusion over Richarlison's future. De Zerbi admits he is unsure whether the former Everton forward will remain at the Tottenham Hotspur Stadium for the upcoming campaign.
"I don't know because I like him as a player and as a guy," De Zerbi explained. "He's unbelievable in terms of attitude and behaviour. But, in the end, we have to respect what he wants to do. I didn't understand well because sometimes he says he wants to stay, sometimes he wants to leave."
Despite the uncertainty, the manager praised the Brazilian's work ethic and impact. Finding a direct replacement will be a challenge if a departure materialises.
"He scored 12 goals last season, not because of luck but because he knows how to score," De Zerbi added. "All of us love him - the team-mates, the club and the staff - because he works hard every day, seriously every day, and we can't say anything about him on the pitch."