Lazio sporting director Igli Tare sympathises with fans unhappy at the departure of Mauro Zarate, but has promised the club will progress.
The Biancocelesti's Argentine No 10 left the Olimpico on deadline day to join Inter in a 12-month loan deal, in a move that upset sections of Lazio's support.
Fans hurled insults at Edy Reja at the club's training ground at Formello, whilst Il Messaggero compared the ill-feeling at the 24-year-old's exit to that felt in 2002 when Alessandro Nesta was sold to Milan.
President Claudio Lotito had earlier this summer declared that only a very high offer would see him sell Zarate, but the move to Inter is at €2m for the initial loan, and a future fee of €15m.
Lazio paid Al-Sadd €20m for the striker in 2009, and were previously believed to be only prepared to listen to offers in and around this price region.
Sporting director Tare, whose work this summer included bringing in Miroslav Klose and Djibril Cisse, offered his thoughts on the controversy: "The fans are right, I understand them. However, Zarate has been transferred for the good of Lazio. He wanted to leave.
"Zarate's departure was not in our strategy, but there were problems during the ritiro [training camp]."
Coach Reja publicly criticised the former Birmingham City man for his recent behaviour that included turning up to pre-season training overweight and refusing to play in the team's Europa League play-off tie against Rabotnicki.
Tare continued: "He remains a very talented striker, but not enough to become a champion. That takes sacrifice and humility. I hope he returns to how he was in his first year as a Biancoceleste, I would be happy for him.
"Lazio remains competitive, our goal is to improve on last season's League position. We have strengthened a squad that is already very strong. I am satisfied.
"I was surprised we were able to release three important players on the final day," in reference to Zarate, Pasquale Foggia and Sergio Floccari all leaving.
"I see the fans' tears, but Lazio will progress and they will be happy. Everything changes but people love Lazio before any player."