After initially struggling for form, Morata sustained a back injury and has been absent from the first-team squad since January 17.
Conte has suggested that he is growing increasingly concerned over the Spaniard, who remains a fitness doubt ahead of the club's Champions League fixture with Barcelona later this month.
At his pre-match press conference, the 48-year-old told reporters: "Players like Morata we are missing for a long period. I don't know, he is trying to stop this pain in his back.
"I don't know and for this reason I am a bit worried as you know very well the importance of this player."
Morata has scored 12 goals from 23 starts and seven substitute appearances in all competitions this season.