Jose Mourinho is surprised Roma are being talked up as Serie A title contenders given "only Sampdoria and Lecce spent less than us".
The Giallorossi finished sixth last season and won the inaugural Europa Conference League in May.
Roma pulled off a huge coup by signing Paulo Dybala on a free transfer and have since brought in Georginio Wijnaldum on a season-long loan deal.
Mile Svilar and Zeki Celik have also joined the Eternal City giants, with Henrikh Mkhitaryan the most-high profile player to depart – joining Inter as a free agent – and Jordan Veretout also moving on to Marseille.
A 1-0 friendly victory over Tottenham and a 5-0 rout of Shakhtar Donetsk have increased the hype ahead of Roma's first Serie A match of the season at Salernitana on Sunday, but Mourinho is playing down expectations.
The Roma head coach told reporters on Saturday: "There are teams that have an economic potential that is not comparable, I'm not saying the distance between Earth and Mars, but there are people who spend €100-150million per season.
"We go play and do the best we can. In the championship we finished in sixth place, our squad improved, we lost Mkhitaryan and Veretout, but we took on players with whom we improved, but other clubs also did.
"For this reason, during this period where I didn't need to talk to journalists, it amazes me when it comes to us in one way, but not about the others. Roma can be a candidate for the Scudetto if they have won 18 titles.
"Only Sampdoria and Lecce spent less than us. Milan and Inter finished with 25 and 23 points ahead of us and improved. There is a lot of noise around us for an interesting match against Tottenham and Shakhtar.
"We talk about us, while there is silence around other teams. Lazio spent €39 million, are they candidates for the Scudetto?"