Alvaro Morata has been one of the most rumoured players to leave at Atletico Madrid. The rumours have been coming from everywhere like from European teams to Saudi Arabian teams. But still there is update on that lately. Felix's returning to the team has raised these rumours. Felix is also in these rumours so maybe one of these strikers can really leave before the transfer window closes.
I don't think Felix would be signed permanently considering Atletico Madrid ask too much money for his transfer fee. Maybe he would be loaned again. If he doesn't then I think Morata will be the leaving one. Maybe he would return to Italy if there is still interest from there.
Alvaro Morata's career has been very special so far, it is noted that he has defended top European clubs several times such as Real Madrid, Chelsea, Juventus and in the end he returned to Atletico. I think that at 30 years old, he is actually still quite productive as a striker and if there is an offer to return from Italy, of course it will be interesting for him to be able to return to strengthen one of the teams in that country.
On the other hand, if there is an offer from a Saudi league team, I think that is also quite good considering that so many players of his age choose to end their careers to get a large salary there. Now the decision rests with Alvaro Morata and even if he does eventually leave it will be the umpteenth time at Atletico.