The Chelsea striker signed for Inter yesterday on a season-long loan.
Vieri told La Gazzetta dello Sport: "Nobody moves like Lukaku: the performance of a team, not just the opponents. With Lautaro they are a couple of 55-60 goals a year in two, one of the strongest in Europe.
"(Paulo) Dybala? The essential purchase was Lukaku, but if Dybala arrives, even better. If they can afford it, Inter would do well to take him because he changes games."
But can all three play together?
"Difficult because it is difficult for (Simone) Inzaghi to give up on 3-5-2."