The Belgian has effectively ruled out a move from Inter Milan in the summer despite growing interest from the Blues.
It comes as the Champions League winners eye a new striker in the transfer window this summer.
Tuchel has made a forward a priority ahead of next season as he looks to build his own squad to battle Manchester City and Liverpool for the biggest prizes.
But the targets are falling thick and fast with Lukaku joining Sergio Aguero and Erling Haaland in the list of no-gos.
So who could Chelsea turn to next
If scouts had their eye on Haaland in the Bundesliga, it would have also been impossible to ignore Silva.
The Portugal international has been in jaw-dropping form for Eintracht Frankfurt, who has scored 28 times in 32 league appearances.
It has not been an easy ride for the 25-year-old, who has struggled at AC Milan and Sevilla beforehand.
But his goalscoring antics have got the world’s best paying attention, with City and Barcelona linked with the ex-Porto star.