Edin Dzeko's transfer to Fenerbache been officially confirmed and publicised and that's why there's nothing that's gonna stop his move to the Turkish club this summer.
Inter Milan's only official striker at the moment is Lautaro Martinez which I'm very sure will remain at the club beyond the summer transfer window.
I am not sure reasons behind this transfer but in latest seasons, some old star players and even young players like Zaniolo decided to play for Turkish clubs. Maybe they pay good salary for those players and beyond top five leagues in Europe, Portuguese and Turkish leagues are most favorite choices of star players. It seems Turkish league is more favorite by old star players and Portuguese league is more favorite by young players.
Dzeko can play for average clubs in Serie A but maybe he want to get better salary for very last seasons in his career in Turkey.
Inter Milan wants to keep Chelsea's Romelu Lukaku at the club but as a loan player while Chelsea wants them to outrightly sign him and that's the disagreement that's surrounding the player's future at the moment. Inter Milan isn't known to be a club that can with just a striker and that's why it is believed that they'll definitely sign a striker this summer
I believe Inter Milan will not take risk and pay big money to sign an official contract with Lukaku. The striker got many problems with his body and fitness in the last two years and his performance is not too good. Inter Milan have to carefully consider a risk that Lukaku will fail to reclaim his good performance back and even will perform worse in coming seasons.