Sarri hooked Morata on the hour mark for Olivier Giroud, admitting he wanted to see greater sharpness in front of goal.
He said, "It depends on the situation on the pitch. At that moment we crossed three, four or five times in three minutes so I thought Giroud, in that moment, was better, but only for that reason. Alvaro is improving and maybe he needs more space.
"But I'm lucky because in that situation Giroud is very useful."