Italy's clubs were relatively restrained in the summer transfer window and the big spenders came as something of a surprise.
Lazio spent more money than any other Italian side during the summer and will hope that they can deliver the results to match.
Club president Claudio Lotito has a fragile relationship with the fans, many of whom accuse him of selling off Lazio's best players before getting the best out of them.
After Lazio sold midfield star Hernanes to Inter in January, fans protested vehemently and very few home games go by without angry chants or protests against Lotito.
The owner has attempted to change things and this summer he invested heavily while protecting his key assets.
The Corriere dello Sport reports that Lazio's spending of just under £24 million topped Serie A while the club also refused to sell Antonio Candreva, Senad Lulić, Keita Balde Diao, Ogenyi Onazi or Federico Marchetti.
Lazio paid just under £8 million to buy the second 50 percent of Candreva from Udinese, around £4 million for Italian international Marco Parolo, £4.8 million for Dusan Basta and £5.1 million for Stefan de Vrij, who had been linked with Manchester United.
They also bought defender Santiago Gentiletti for £1.2 million and snapped up Filip Djordjevic and Edson Braafheid on free transfers.